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View Full Version : Computer switches off randomly



gradebdan
22-12-2009, 09:10 PM
I can be working on my computer and then about once a day it will switch itself off and then restart. This happens whether I am on the internet or just the comp. This can happen on any program I am working on. Does anyone have any clues about what might be beginning to fail please?

Blam
22-12-2009, 09:14 PM
Is it like a normal shutdown with the shutdown screen etc, or does it instantly just turn off, as if there has been a power cut?

gradebdan
22-12-2009, 09:18 PM
Hi Blam. It's like it's been switched off at the wall. There are no shut down screens. Just goes black instantly then restarts normally.

Blam
22-12-2009, 09:30 PM
Hmmm...likely that the CPU is overheating, or the PSU is going crazy:p

http://www.almico.com/speedfan.php

Download speedfan and see what the CPU temps are, or check in your BIOS if you can.

Might want to buy a cheap can of compressed air(Dick Smith Electronics) and clean out the innards of the desktop PC to, probably clogged wth dust(which can cause overheating)

Blam

gradebdan
22-12-2009, 09:38 PM
Getting late now but will do a cleanup of the innards tomorrow.

wainuitech
23-12-2009, 08:37 AM
Another sign of overheating if thats the case, is it wont start up right away again, you have to leave it a few minutes to cool down.

gradebdan
23-12-2009, 09:29 AM
It always restarts straightaway.

Tbird650
23-12-2009, 10:44 AM
That sounds like the ram.
Test the ram memory with memtest:
http://www.memtest86.com/download.html

tweak'e
23-12-2009, 11:11 AM
more common is PSU failure. sometimes you can hear a squeak from the PSU just before it crashes.

also is the auto restart turned off?

gradebdan
23-12-2009, 08:14 PM
I took the comp. apart and found most of the "breather holes" around the outside of the case were blocked up, used the vacuum on the outside and the DSE air can around the fans. Will give it another go now. Looked at MEMTEST but wasn't sure I could manage to drive it correctly so left it.