Im having a problem with a computer that appears to randomly lock up at various times and there is no way to shut down the computer unless I turnoff the swith on the supply. I have replaced the RAM and ran diagnostic on the machine and it still freezes. Is there anything else that I can do?

Getting hot problem maybe !!
Check inside to amke sure the CPU fan and powersupply fan and any other fans aren't full of dust!

You also might want to check your graphics card that will also make your computer lock up if it's to hot or just utter crap.

Do you do any Over Clocking? If so on what?

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