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Whenever I power on my computer, it will automatically power off on it's own and keep repeating this. The power supply was replaced, but it was not the issue. What is going on here?

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  • MazoSergey
    MazoSergey Oct 02, 2010

    It mean's that it cannot strart windows? (By the way what windows you have?)



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First of all unplug from mains, take out any new hardware, if not then dont worry, you will need to unplug every peripheral from the computer any usb devices ie printer, scanner and cameras, unplug the harddrive and the any cd-roms or floppy drives you have by unplugging them from the power supply and the ribbon cables or sata cables need to removed also, you should only be left with a barebone system as it where, graphics card if not onboard, processor and memory modules,keyboard and mouse, if not sure about disconnecting everything, either write it down before disasembly or take photos of it before you start, so you have a reference to look back to.
Now boot the pc up, if it posts you should be left with a black screen that say "INVALID BOOT DISK" leave the pc like that for a few minutes to make sure it is stable and it is not a bios fault restarting the comp all the time.
If it does reboot, turn the pc off at mains, check how many memory modules you have, they should be just below the processor fan on the motherboard, if you have more than 1 then take all out, remember where each one was as you will be able to assatane if one is faulty and which it is, take the memory module from the last slot and put it into the first slot and reboot the mechine. repeat this until the pc runs stable, you should now be able to see if it is a memory issue and which module it is that is faulty.
If all is well and and there is nothing wrong with the memory and it is still doing the same thing on each memory module then you will have to turn to the processor, it may be over heating, this will cause the pc reboot or shut itself down to save the processor. To check that it is not this, you will have to remove the fan and heatsink from the processor, when you take the heatsink and fan off you will notice a subtance on both, this is heatsink compound, it is used to dispurse the heat through the heatsink and away from the processor, therefore keeping it cool enough to run properly, clean it all up with an alcohol based fluid, and then you will need new heatsink compound, you will be able to pick this up at your local pc store, re-aplly the heatsink compound to the processor, spreading it on evenley to ensure the whole of the metal part of the processor is covered then put the heatsink and fan back into place, make sure the fan wires are reinserted onto the board. Restart your pc.
If all is fine then you should have a stable pc that will stay on and not reboot.
Now turn the power off at the mains, reinsert the cables for the cd-rom and floppy drive if you have one and reboot, once again if all are fine shut down and insert the hdd cables and power cords, and reboot. If all good then you should have a stable bootable pc, if not you may find that its just a simple bios setting conflicting, you will have to reset the factory defaults in the bios, to do this as the pc boots press DELETE this should take you to the bios, look for load default setting or load factory settings, tab to them using the arrow keys click enter and then save and exit the bios, the pc should now reboot. if you still have the same problem after doing all this then it is possible that you have a more seriouos fault, possibly a short somwhere or you may have a faulty motherboard. post back your findings i will be intersted to know how you get on. thanks.

Posted on Oct 02, 2010

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Have your motherboard and your video card checked.

Posted on Oct 02, 2010


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There are higher chances of a computer shutting down due to the interference of a computer virus. The virus gets into the computer and fiddles with crucial sections of the operating system, which may cause the system to shut down automatically. You need to install a good antivirus software and get the computer scanned thoroughly for any malware and viruses. Also see to it that the operating system and all hardware drivers are updated.

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