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Computer crashing for no apparent reason


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#1 Samboy

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Posted 03 March 2011 - 12:51 AM

G'day,

Starting today my computer has been randomly turning itself off, although running lights are still on, and the computer sounds as if it is still running normally.

Essentially what happens is that it crashes out, the monitor says input signal lost and then nothing happens. First two times it crashed whilst using Photoshop. Third time I installed a program to monitor the HDD temp. It was running just over 40c when it crashed again (had a low end game running to see if the HDD temp would rise). I waited 30 min before turning the computer on each time.

Opened the case to check for any build up of dust, it seemed fine.

Edit: I have also checked that all the cables are plugged in correctly.
Also definitely something wrong, because holding down the power button didn't turn it off. Had to turn the computer off by the switch at the back of the computer.

System:
Windows 7 64
4 GB RAM
2.8GHz Quad core
500GB Seagate HDD

Only thing new with the comp today was updating Microsoft.Net framework, a few hours before the first time it crashed. No idea if that is related or not.

Thanks for all help in advance,

Sam.

Edited by Samboy, 03 March 2011 - 12:54 AM.


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#2 Allan

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Posted 03 March 2011 - 07:55 AM

EXACTLY what happens after the display says it has lost its signal? This sounds more like the system is going into power saving mode than "crashing".

#3 Samboy

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Posted 03 March 2011 - 01:33 PM

Definitely not going into powersaving mode, unfortunately. Problem has become progressively worse, to the point it crashes after 20-30 seconds (regardless if I'm in BIOS or loading into windows). Definitely not overheating either. Now it powers off completely, instead of pseudo-shutting down when the computer was still running.

I'm under the impression that it is hardware related, given that it crashes in BIOS as well. Not sure exactly what part is malfunctioning though.

Edit: Spelling

Edited by Samboy, 03 March 2011 - 01:34 PM.


#4 Allan

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Posted 03 March 2011 - 02:26 PM

Most likely causes would probably be power supply, motherboard, ram, or processor. Do you have a spare power supply you can try?

#5 Samboy

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Posted 03 March 2011 - 09:35 PM

Cheers,

No I don't but I'll go buy another and find out.

Thanks for the help,

Sam.




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