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here are the symptoms: 1) I get bsod spontaneously, it could be a few minute into usage or couple hours into usage, sometimes a whole day before it crashes. 2) I get a different error every time i get a bsod, its either from bad video drivers, bad usb ports, bad memory and bunch of other random reasons as suggested by dump files. 3) The above only happened very recently, the computer was rock solid for months. what i've done to find out the cause: 1) I used driver verifier to check my drivers, they appear fine but I reinstalled my video driver anyway. 2) I used windows memory diagnostic to test the ram, they appear fine (note: I did go through THREE PAIRS of ram on this computer, they seem to go bad every once in a while, this one I bought earlier this year). 3) I checked out the PSU, which according to Speedfan is running two of the three +5V rails at 6.85V,while all other voltages are within 10% tolerances. Is this a cause for concern? 4) I checked my hardware cooling, they are fine, no over heating according to Speedfan. 5) I used disc check on my main hard drive, it appears there is no corruption or bad sectors. my specs: AMD Phenom II X4 980 CPU Asus M4A785TD-M-EVO Mobo 16gb Corsair Vengeance Ram 1TB Hitachi 3GB Sata HDD (Dual drive format for dual booting Win7 and WinXP) + a 2TB WD Black 3GB Sata HDD + 3TB WD Blue 6GB Sata HDD + 1TB WD Green (External HDD) AMD 7970 HD GPU Asus Xonar DX SPU OCZ 700Watt Modular PSU my question: can bad psu cause random bsod? I've yet to be able to resolve this matter...