I posted in windows 7 section the thread "is it psu?" about many problems my customer has with her computer here it goes: (admins if necessary move it from windows 7 to here, I can't do it) "Hi everyone, I visited a customer today who has a desktop computer stuck inside a computer table and the fans instead of behind where always on the side against the wood (hot place, lots of use) what damage could that have done? The thing is: Lots of times the computer does shut down directly without any error messages or restart in the same way or it would just freeze when booting at the windows 7s "starting" logo phase. I checked ram with windows memory diagnostic tool, ram is ok when CPU is under heavy load psu voltages drops do you people agree is the PSU to blame? specs: mother: doesn't matter asus m4 something processor: phenom x4 965 ram: 2gb ddr something must be 2 I guess by the processor's age psu: generic garbage (no brand) also noticeably small (never seen a PSU so small in size) I need help I don't have spare parts to test neither the money to buy them thanks"
Sounds like a cheapass PSU with less power than advertised. Did you also checked the temperatures of the CPU and GPU? How much is the voltage drop?