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Solve : Is my motherboard causing my PC to freeze??

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Hi guys,
I've got an (very) old PC from 2008. After I dropped it somewhere for about 2 years or so, yesterday when  my laptop broke, I remembered that I had this old rig.  So I took it out and tried to boot from a linux live USB and to my surprise it worked like a charm.
 
However after a while I went on Youtube to watch some videos when suddenly it froze, completely. No mouse movement, no keyboard...nothing. First I thought the CPU might have been the culprit but no...then I checked the RAM (from the BIOS) it seems to be FINE too. Then I installed Windows 7 on it. DOWNLOADED SpeedFan and HWMonitor and went on Youtube again, while watching videos I noticed that one of the temperatures was constantly INCREASING, from 38 to over 60 and then the PC froze again at about 62. I believe it is the motherboards temperature since HWMonitor shows it as Motherboard temperature.  Both SpeedFan and HWMonitor show the same temperatures so I guess the sensors are working fine.
 
So my question is could an overheating mobo cause a PC to freeze just like that or am I just guessing wrong? And if yes, is it somehow possible to prevent themobo from overheating or I need to run the fans at 100 just like I am right now?
 
HP Compaq, Intel dual core 3.0. 2 GB RAM. 40GB HDD (internal), 250 GB (external, from broken laptop).
Thanks in advance. Quote

my question is could an overheating mobo cause a PC to freeze just like that
Yes.
Clean out the dust. Check the fans.
From the CH  Help archives.
How to clean a computer system fan
 Thanks for the reply and the link. I'll open the case and see what I can do.

Any thing I should keep in mind, anything I should stay away from? I'm kinda worried I could get electrocuted by a faulty PSU or something! Like I said the rig is old.Pull the plug. Sometimes a PSU will CLICK on if you touch something. S
So pull the plug first.


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