i bought a full system 4 months ago
have been getting random BSOD,
most of the time only during a long period of computer rest,like after the destop is turned off overnight and i use it early at the morning(most of the time like this),
i tried memtest,HDD tool,linx and prime 95 stress test,all come back with no error,
check disc,sfc/scannow tried,no problem.
A name brand 400-450W psu (the specs for most models call for a 450 or 500w) would probably be OK but a no-name unit would be suspect -- it probably can not provide enough stable wattage to keep the system running under load (even though the 5770 is not the highest wattage card it does need a good stable source of power)
I would agree the power supply could be suspect. What are the ratings on it, specifically 12V ratings. Does it have a 6 pin or do they use an adapter for that power to the card? Not enough power can cause a crash.
if not enought power will cause the crash,
but during heavy usage of the computer i dun have any problem at all,
i alway play game for 5-6 per day and sometime up to whole day when weekend,
the crash only happen when startup