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Computer cut off after a few seconds - Computers & Internet

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  • marlbr1943 Dec 29, 2010

    The computer cuts off afterI turn it on. iwas was working fine, then one day it started to citting off. I'm using XP and the the mother board is an asrock, K7S41GX and it was dusty inside. thanks for your assist.

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Hi.

To start ensure that no device is connected to the computer while the system shuts down. Disconnect USB devices and printers. If computer is a desktop leave only display, keyboard and mouse.

The most common cause for sudden shutdown is overheating:

Ensure that you tested for overheating by Starting computer in command prompt mode (press f8 on startup). If system shuts down in this basic mode, then it is likely overheating.
If OS is starting, then another (and better) way to test overheating is using a Windows software like SpeedFan to monitor temperature raising from Windows. Observing fans and simply checking that they start and run is not a valid overheating test.
If computer is overheating replace the cooling fans.

If computer is not overheating, other cause for shutdown is operative system troubles:

If a computer turns off at random time, the first thing to do is looking for eventual system troubles. Only after ruling out eventuality of software problems you can investigate possible hardware failures causing the shut down. Installing a new system or starting the machine with a different operative system is a necessary step in troubleshooting.

The best way to test for software troubles is using a Boot Disk. You can use a Linux Boot CD, build a Vista boot disk, or use a pre-made bootable disk like Win XP Bart PE version. If you use a Linux or Windows XP disk, you may need to go to BIOS and force the SATA hard drive to IDE mode, as this systems may not be able to recognize the disk in SATA mode (otherwise you get no C: drive).

If the computer does not shut down while running system from the boot CD, then the problem is the system. In that case the system must be reinstalled. An upgrade installation will not be enough. If problem is system, backup data and perform a complete Windows setup formatting the hard drive.

If computer is shutting down while using different systems, then the problem is hardware.

Before going for the main board the standard prcatice is testing other common causes for random and sudden shut down. First part to be tested is the RAM.
A defective RAM can cause sudden shutdown at random times. If you have two RAM sticks you can use either one alternatively. If there is only one RAM stick, you will need to use a replacement.

If none of the above is the problem, then the computer must be disassembled.

In case you have a desktop, disassemble and test motherboard with a minimum set of devices. Connect only PSU, CPU and FAN, RAM, and on switch.

In case the computer is a laptop:
First test after disassembly often consists in starting the laptop with a minimal set of connected devices. Disconnect optical disk, keyboard, hard drive, other devices eventually present (such as card reader) and start main board almost stand alone. Depending on the laptop design you may need to short the startup switch. Repeat the test with HDD connected (this will start system).
Also check power connector solder joints, eventually re-heating them. Check all screws holding main board as they warranty grounding to main pcb.


Usually when computer is turning off randomly, is either operative system, RAM or overheating.


Regards.

Ginko.

Posted on Dec 29, 2010

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I'm working at my father's PC service place and store and I face that problem an a daily basis. You should check the following things --->

1.See if your CPU is properly placed on your motherboard. You should also check the CPU's pins. If there's a problem, you should propably buy a new CPU.
2.Try to open it with a different Power Supply Unit. Your's may be damaged.
3.Your motherboard may be damaged or dirty. Clean it carefuly without using chemicals or water. If it's damaged, replace it.

WARNING:NEVER OPEN PC'S CHASSIS WHILE ιν ELECTRICAL CURRENT. REMOVE THE POWER SUPPLY UNIT'S CABLE BEFORE OPENING THE CHASSIS.

Hope this helps :)

Posted on Dec 28, 2010

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