Hello everyone, I recently had issues with my pc (which I built 4 years ago), not posting and giving me "mobo beeps". I tried to diagnose the problem basing on the beep codes but I couldn't figure out what it was (it indicated a keyboard bat problem). At first, it posted only sometimes, especially after leaving it off for some hours, then it started not booting and just giving me beep codes. After trying some components with a friend's pc, I bought another mobo (my socket is old so they are cheap) and it seemed to have solved the issue, now booting perfectly. Today, it began to do the same thing: at first it boots, but if I use it for sometimes and then reboot, blank, no video (although drives and fans work). I tried to measure the psu voltages and the values are all within tolerances (both without load with a voltmeter and in the bios). Could the psu be defective? If so, could it have damaged my old mobo? Notice that when it boots, the system has no problem whatsoever, no spikes, no crashes, no shutdowns, the problem lies only at the startup. My specs are: PSU: corsair cx430 Mobo (previous): asrock extreme4+ fm2a88m Mobo (new): gigabyte f2a88xm-ds2 Cpu: AMD A10-6800K Ram: G.Skill Ares F3-1866C9D 8GB I don't know what to do anymore! Thank you very much for any reply.