CPU starts but monitor displays no signal [SOLVED]

Due to problems in the computer hardware, the display may not receive a signal when the monitor is turned on. Even though the CPU may seem to be running, there could be no display on the monitor. This could occur due to problems in the CMOS, RAM, VGA card or the cable which connects the CPU to the monitor. All components inside the computer casing are prone to dust particles which may deposit on the hardware components and prevent them from working properly. Sometimes cleaning the CMOS battery and the RAM can help solve display problems. The monitor cable and VGA should also be checked. 

Issue

I have a problem with my computer. Until a few days ago it was running normally but now, when I turn it on, the monitor displays "no signal". The cpu fan and video card fan are working fine. The casing's fan is also working fine but the monitor's LED goes blue and after a few seconds, it turns to orange and displays "no signal". I am not sure why this is happening and how the problem can be solved. I tried swapping the memory card with my new one but it still won't work. I unpluggled the keyboard, Mouse and Hard disk but it still displays "no signal". If I remove the memory card from the slot it beeps, which means the memory card slot is working fine. Can someone please help me with this problem?

Solution

You need to clean your CMOS battery which is attached with your motherboard; this is just like a watch battery and after you clean it out by rubbing it a little bit put it back in. Then clean your RAM by pulling it out and also dust off your CPU. These solutions may not be the answer though: if you are still having problems, then you must check your monitor cable and the VGA card. Once done, reassemble your CPU and it should all start working again.

How to make bootable Pen Drive through command prompt and use it for installing Windows 7

Steps:-
1. Open Command Prompt As Run as Administrator.

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    

 2. First type diskpart and press enter.It will open new cmd window.
 3.Next type list disk command.It will list Disk number.In the below screenshot  Disk 0 is hard disk and Disk 1 is pen Drive.

   

4.Now type select disk 1 command in order to select your pen Drive(here Disk 1).

5. Now Type clean command in order to clean pen Drive.Here is the screen shot.

6. Now type create partition primary command to create primary part.

7. Now type select partition 1 command  in order to select primary part.Here is the screen shot.

8. Now type active command in order to active selected part.

9. Now type format fs=fat32 command to assign format.It start formatting your pen Drive , and take few minutes so please wait  to finish. Here is the screen shot.

10. Now type assign command.

11. At last type exit command. your pen Drive is ready to use.Use wherever you want to use like for installing Windows 7.

12. Copy all content of Windows 7 DVD folder (from your computer) and paste inside your bootable Pen Drive.

13. When the copy finishes, you are done. Use it to install Windows 7 in your computer/laptop  or others.  

How To Enable Weather App Service in Apple IOS 7

iOS7 gives you the opportunity to get information about the current weather at any time and in real time via the message center? To enable this option:

            ·         On your iPad or iPhone, go to Settings.

            ·         Scroll to Privacy

            ·         Then select "Location Services"

            ·         Scroll down "Weather" and turn this feature ON.

Use Pen drive as RAM

How to Use USB Pen drive as RAM of Computer

U can increase your RAM without any extra investment. This trick will surely improve the performance of your computer and increase operational speed. Here you have to use a USB pen drive or flash drive, which can be used as RAM of your computer. Before trying this trick, make sure this can damage pen drive so be careful. Just follow given steps carefully

How to use USB pen drive as RAM in Windows XP :-

1. First connect your pen drive to computer. Note that pen drive should be at least of 1 GB.

2. Now right click on the my computer and then click properties.

3. Click on Advanced Tab and then Performance.

4. Now click on Advanced and then click on Virtual Memory.

5. Select your pen drive icon and click Custom size.

6. Now view the memory available in your pen drive and note it down then click on OK.

7. Restart your computer and enjoy your fast system.

How to use USB pen drive as RAM in Windows Vista and Windows 7 :-

1. Insert your pen drive and format it.

2. Right click on your pen drive and click on properties.

3. Now click on Ready boost tab and then Use this device.

4. Choose maximum space to reserve system speed then click on OK and Apply.

You've done! use your pen drive as RAM.

Computer POST and Beep Codes

POST:-

The computer Power-on self-test (POST) tests the computer to make sure it meets the necessary system requirements and that all hardware is working properly before starting the remainder of the boot process. If the computer passes the POST the computer will have a single beep (with some computer BIOS manufacturers it may beep twice) as the computer starts and the computer will continue to start normally. However, if the computer fails the POST, the computer will either not beep at all or will generate a beep code, which tells the user the source of the problem.

BIOS Beep Codes:-

AMI BIOS beep codes:-

Beep Code	Descriptions
1 short	DRAM refresh failure
2 short	Parity circuit failure
3 short	Base 64K RAM failure
4 short	System timer failure
5 short	Process failure
6 short	Keyboard controller Gate A20 error
7 short	Virtual mode exception error
8 short	Display memory Read/Write test failure
9 short	ROM BIOS checksum failure
10 short	CMOS shutdown Read/Write error
11 short	Cache Memory error
1 long, 3 short	Conventional/Extended memory failure
1 long, 8 short	Display/Retrace test failed

Phoenix BIOS beep codes:-

Beep Code	Description and what to check
1-1-1-3	Verify Real Mode.
1-1-2-1	Get CPU Type.
1-1-2-3	Initialize system hardware.
1-1-3-1	Initialize chipset registers with initial POST values.
1-1-3-2	Set in POST flag.
1-1-3-3	Initialize CPU registers.
1-1-4-1	Initialize cache to initial POST values.
1-1-4-3	Initialize I/O.
1-2-1-1	Initialize Power Management.
1-2-1-2	Load alternate registers with initial POST values.
1-2-1-3	Jump to UserPatch0.
1-2-2-1	Initialize keyboard controller.
1-2-2-3	BIOS ROM checksum.
1-2-3-1	8254 timer initialization.
1-2-3-3	8237 DMA controller initialization.
1-2-4-1	Reset Programmable Interrupt Controller.
1-3-1-1	Test DRAM refresh.
1-3-1-3	Test 8742 Keyboard Controller.
1-3-2-1	Set ES segment to register to 4 GB.
1-3-3-1	28 Autosize DRAM.
1-3-3-3	Clear 512K base RAM.
1-3-4-1	Test 512 base address lines.
1-3-4-3	Test 512K base memory.
1-4-1-3	Test CPU bus-clock frequency.
1-4-2-4	Reinitialize the chipset.
1-4-3-1	Shadow system BIOS ROM.
1-4-3-2	Reinitialize the cache.
1-4-3-3	Autosize cache.
1-4-4-1	Configure advanced chipset registers.
1-4-4-2	Load alternate registers with CMOS values.

AWARD BIOS beep codes:-

Beep Code	Description
1 long, 2 short	Indicates a video error has occurred and the BIOS cannot initialize the video screen to display any additional information
Any other beep(s)	RAM problem.

Macintosh startup tones:-

Tones	Error
Error Tone. (two sets of different tones)	Problem with logic board or SCSI bus.
Startup tone, drive spins, no video	Problem with video controller.
Powers on, no tone.	Logic board problem.
High Tone, four higher tones.	Problem with SIMM.

All the folder in my pendrive become shortcut

If you did not format your flash drive, then check whether the files are not in

hidden mode.

Click on "Start" -->Run-->type cmd and click on OK.

Here I assume your pendrive as H:

Enter this command.

attrib -h -r -s /s /d h:\*.*

Note : Replace the letter h with your flash drive letter.

Now check for your files in Pen Drive.

Architecture Of Hard Disk

What Is a Hard Disk Drive?

Your Hard Disk or sometimes called a Hard Drive, is the main storage space inside your PC. It is a permanent storage component unlike the RAM (Random Access Memory). It is possible for your computer to function without a hard disk, however it would be basically useless to you as you would not be able to use an Operating system or have any programs to use. Unless you had another form of mass storage device such as an SSD (Solid State Drive).

Hard disks use circular hard platters to store data on. They are in pristine condition with a mirror like finish to them. These platters are locked away inside a steel casing as unclean air can easily ruin a hard disk. This is why you should never remove the casing from the hard disk, it is very unlikely you will be able to put it back together as a working component. Even a small amount of dust can render a hard disk platter useless.

Below you can see a labeled diagram of a hard disk. The model is a SCSI (Small Computer Scientific Interface) You can see the hard platters on top of each other with a set of arms which hold the read/write head. The speed of the arm is truly amazing as well as the accuracy of the head which can read and write to perfection on a platter which is rotating around 7200RPM. The hard disk looks a very simple idea and probably is, however a lot goes on before the simple writing to the disk its self. We will explain a little more later in the article.

How does the hard disk store data?

On each of the platters there is a thin layer of magnetic film. Data storage on hard disks is very similar to that of a cassette tape. Data is stored in many 1's and 0's stored in different directions on the magnetic film by using a very fine oxide. These binary digits are arranged in different ways to represent different characters. When these are read back by the head the data is retrieved and processed. because no physical contact with the platters is made the disk can be re-written time and time again without damage to the disk or its platters.

File Systems

A file system is the way in which your computer stores data on the hard disk. The most common file systems are FAT16 for older computers, FAT32 and NTFS. FAT stands for File Allocation Table. NTFS stands for NT FileSystem. Both have advantages and disadvantages. FAT16 was a very limited file system in the way that it would store data very in-efficiently, every file would take up a minimum of 32Kb in space as this was the minimum cluster size in a FAT16 system. Also it was only capable of using hard disks up to 2Gb in size. FAT32 solved this problem by reducing the cluster size to 4kb which saved a lot of wasted space and also allowed disk sizes up to 2 Terra bytes. NTFS is believed to be a far greater file systems than any of the FAT's. The cluster sizes can be altered to anything as low as 512bytes which means almost no wasted space on the hard disk. The maximum disk size is a unbelievable 256 Terra bytes, which is very big !!!. NTFS also has added security for file loss.

Measuring the Speed of a Hard Disk

There are various ways of measuring the speed of the hard disk. The main ones are the maximum data transfer rate, the spindle rotation speed and the seek time.

Maximum Transfer Rate - This is the highest amount of data that can be transferred per second. Common forms of hard disks come with an ATA format. the speed rating of an ATA100 disk would be 100Mb/s. Likewise a ATA66 disk would be able to transfer a maximum of 66Mb/s. Past the older ATA standard just mentioned comes the newer S-ATA standard (serial- ATA). S-ATA 1.0 transfers at a max rate of 1.5Gb/s S-ATA 2.0 transfers at a max rate of 3Gb/s and S-ATA 3.0 can transfer data a maximum rate of 6Gb/s

Spindle Rotation Speed - The rotation speed of the disk really is the basis of the other two factors of hard disk speed. The faster the rotation speed, the more data can be written per second and the quicker it is to find the correct data on the platter. A Common speed is 7200RPM (revolutions per minute)

Seek Time - The seek time of a hard disk is the average time it takes for the disk to find the data you need on the platters. A fast spinning, highly accurate and responsive disk will have a shorter seek time and will perform much better, especially when the data is scattered around the disk. Seek time is measured in milliseconds.

Why a hard drive has less storage space than promised?

It has happened to most of us. We buy a new hard drive (or maybe a flash drive) with mind boggling storage capacity only to find that it has less space than what was mentioned on the box. Angered, we start cursing the manufacturer and our dealer for false marketing thinking that they should be sued for doing this. Hey, but have you ever wondered how they continue to do this again and again without getting into legal trouble?

The answer is that they are not marketing it falsely at all. Surprised? I'll explain.

A manufacturer considers 1 Megabyte to be 1000 Kilobytes, 1 Gigabyte to be 1000 Megabytes, 1 Terabyte to be 1000 Gigabytes and so on. This is correct considering that kilo means 1000 and mega means 1000000 (10^6). However, computers calculate on base 2 and to them, 1 MB is actually 1024 kilobytes, 1GB is 1024MB and 1 TB is 1024GB. This difference in the method of computation is responsible for this "missing space."

Lets take an example of a 500 GB hard disk.

From a manufacturer's point of view, the 500GB will have 500*1000*1000*1000 = 500000000000 bytes.

From a computer's point of view, 500GB is actually 500*1024*1024*1024 = 536870912000 bytes.

So, a hard drive that promises to have 500 GB storage space will actually display 465.66GB, 536870912000-500000000000 = 36870912000 bytes (34.34GB) less storage space when connected to a computer.

Space Promised	Displayed on a computer	Difference
100GB	93.13GB	6.87GB
250GB	232.83GB	17.17GB
500GB	465.66GB	34.34GB
1TB	931.32GB	92.68GB
2TB	1862.64GB	185.36GB

Take a look at the table given above to see how much space is "lost" due to computers working on a base 2 system. As you can see, with the increase in capacity of the storage device, there is an increase in the missing space.