Hello, hope anyone can help me, my PC is shutting off often, i was thinking it was my PSU, i buy a new one, and the problem persists. I checked out my house voltage to see if it was under or upper limits but it seems ok and constant. No excess heat seems to be going on the PC, in fact sometimes but not always the shut off comes right after i turn the PC on. It is just as if i pull out the power cord. No specific program, software or situation seems to be causing the failure. It just shuts off, no restarting. Thanks a lot. My specs: Pentium D 3.4 1 MB Ram. ATI X1300 AGP Videocard. ASUS P5VDC-MX Mobo. 500W PSU. 80 GB HDD1, 40 GB HDD2. DVD / CD Writer Recorder, etc.