My computer does not start unless I restart it multiple times

My computer does not start unless I restart it multiple times.
it is due to ic of main board is swell or burst it is simple to identify by seeing the normal size of ic of mainboard if you find change in shapeor size(swell).....

go to the computer repairer shop and to replace them simple...............
or visit these links

• http://www.edaboard.com/thread161775.html 

Repairing boards requires a high level of skill. Here is a useful link:

• http://www.youtube.com/watch?v=ctHTF3oNdxI
  
  Here are some more links:
   
• http://www.youtube.com/watch?v=7kyaz4Zrd78&NR=1
   
• http://www.youtube.com/watch?v=EReltsGXaCs
   

My computer does not start unless I restart it multiple times

Computer not passing POST

If your computer is not beeping or beeping irregularly when it is not starting see the POST troubleshooting steps. 

Bad power supply or inadequate power supply

A bad, failing, or inadequate power supply is often the cause of this issue. If the hard drive is not getting enough power during the first time the computer starts, it will be unable to spin the hard drive platters fast enough to start the computer. However, if you restart the computer two, three, or more times, because the platters are already spinning, it is able to get the drive up to speed and able to boot off the drive.

If you're encountering this issue after installing new hardware in the computer, it's also possible the power supply in the computer is not supplying adequate power to the computer. For most computers we recommend you have at the least a 300-watt power supply.

Our first recommendation is to replace or replace and upgrade the power supply in the computer.

Bad hard drive

This issue can also be caused by a failing or bad hard drive. Similar to the above issue, if there is a failure within the hard drive that is causing the disk platters to not spin up fast enough during the initial power up, you may also encounter this issue.

If after replacing the power supply you continue to experience the same issue, it's likely that the hard drive is at fault and we suggest the hard drive be replaced.

Other hardware issue

Although not as likely as the above two causes (bad power supply or hard drive), other hardware can potentially cause this issue to occur. Below are some other possibilities that may cause this issue.

Cable

Replace the IDE/EIDE interface cable connected from the motherboard to the hard drive. If the cable is defective it could cause various issues with your hard drive.

Motherboard

Finally, if the computer continues to exhibit the same issue after following all of the above steps, it's likely that the motherboard is defective and that it should be replaced.

Troubleshoot a BIOS or CMOS 'Checksum' Error

Fortunately, this sounds like a pretty easy problem to fix. I don't think the driver-update utility is to blame here, but rather a poorly timed CMOS-battery failure. See, most desktop motherboards have a small battery that supplies power to the BIOS even when the machine is turned off. This battery might last two years or it might last 10, but when it fails, you'll often see an error message like the one above. (Your system will also fail to keep proper time, as the clock is one of the elements powered by that battery.)

Most CMOS batteries are standard CR2032 "button" cells, which cost no more than a few bucks at your local drugstore, but check your motherboard documentation just to be safe. Replacing one is usually a two-minute job: pop out the old one, pop in the new one, and you're done. After that, you'll probably need to venture into the BIOS to reset the clock and double-check other system settings (like boot priority).
Just be glad this didn't happen to your laptop. Laptops use CMOS batteries just like desktops, but on most models they're difficult--if not impossible--to replace

Error: CMOS Checksum Bad

This document pertains to all  Desktop Computers.

One of the following error messages appears when starting the computer:

BIOS ROM checksum error
System CMOS checksum bad - default configuration used
Press to resume, to Setup
CMOS Checksum Bad
Press F2 to Run SETUP
Press F1 to load default values and continue
CMOS Checksum Error - Default loaded

The error that appears depends on the type of BIOS used. Any of these error conditions indicate that a Basic Input/Output System (BIOS) test failed.

There are two main reasons why a BIOS test fails:

The battery on the motherboard has lost its ability to supply power. The system time and date are also affected by a bad battery.
The BIOS was updated "incorrectly". This can happen if power is lost while updating the BIOS, or when the BIOS is updated with an update that was not downloaded from orignal website or resource, or when a certain virus or malicious program modifies the BIOS data.

How To Adjust Dell Laptop Screen Brightness

If you find yourself straining to read the text on your Dell laptop screen, it may be the backlight needs to be brighter. Or while you are working in a darkened room, you may want to decrease the brightness of the screen. With these easy steps, you can adjust the brightness of your Dell laptop.

Here are the steps to adjusting the brightness of your Dell laptop screen:

• Right-click anywhere on the desktop. A drop-down menu will show, after which, choose “Display Properties”.
• Choose “Color Correction”. This sub-window will let you adjust the hue, brightness and contrast settings of your laptop screen.
• Find the brightness slider bar. Move the bar to the right to increase brightness and to the left to decrease it.
• Left-click on “Apply”. The brightness of the screen should change based on your selection.
• Close the “Display Properties” window.
• There are other ways to change the brightness conditions of your laptop screen. Use them in case the aforementioned steps do not work.
  • Alternate method #1. Hold the Fn button down while pressing the up-arrow key to increase brightness or down-arrow key to decrease it.
  • Alternate method #2. An ambient light sensor is equipped in certain Dell laptop models. Placed at the bottom of the display panel, the sensor detects surrounding light levels and adds or reduces the backlight by itself accordingly. You may switch the ambient light sensor on or off by holding down the Fn key while pressing the left-arrow key. If your unit does have an ambient light sensor, avoid covering it with tape or dirt.
  • Alternate method #3. Enter the BIOS setup by pressing the F2 key when the initial boot screen appears. Once in BIOS, go to the “Video” options, look for the default brightness setting then modify it to your preference. Afterwards, press the ESC key then select Save and Exit to reboot the operating system.
  • Alternate method #4: Every Dell laptop has a program installed called “Dell Quickset”. Look at the taskbar for the Quickset icon, double-click to open the window then select “Hotkeys”. The brightness control is available among the menu items. If the icon is not in the taskbar, look for the Quickset application in the list of programs in the Star menu then click it. If your laptop does not have the “Dell Quickset” app, you can download the installer from the Dell support website. Look for it in their search bar, download the installer, run it, follow the instructions, then reboot the system if it asks you to.

Avoid setting the brightness level too high; it will strain your eyes and you will need to rest it more in between your laptop work. Remember to rest your eyes frequently when working in front of a monitor. You can also reduce battery consumption by working with minimal screen brightness. Your laptop will automatically lower its brightness setting when you remove the plug from the electrical socket, converting the model to battery mode.