@topgear- Can you explain WTH PSU has got to do with system restart thing after shutdown ? I see, some of the members blindly blame PSU for literally "anything". I agree his PSU is crap, but his problem is very diff IMO.
A crap PSU can make a lot of things so most of the time crap psus are blamed for anything
psu is workin gr8 man ...no power issues...can anything be wrong with my hdd??
I know its fine, anyways that comment was for topgear & other members who are bindly blaming PSU for "anything". I don't think that your HDD could be the problem. I guess either BIOS or some kind of settings in mobo.
How do you know that Op's psu is fine - have you personally checked that unit ?? on the previous comment you said something different
anyone is not blindly blaming only the PSu for Ops issue - blaming crap PSu is among many other possible reason and this might not be even a Hardware related issue either.
Op has not mentioned what OS he is using ( I can't find any ) and this is a common issue that many XP users have faced and there's a lot of issue can be behind of this - like malware, recently installed software, driver or OS updates, any change in OS settings etc.
But it's still recommended to use a better quality PSU for HD6950 and after getting one Op should tell us if he has scanned his system with updated AV, recently installed any software, driver or OS updates, any change in OS settings - any software or hardware chnages before this issue showed up.