My Computer: M4A89GTD PRO/USB3 AMD Phenom II X4 965 BE Nvidia GTX 260 core 216 OCZ Plat 4GB DDR3 2000 Antec TruePower 430W Crucial C300 RealSSD 64GB (Windows 7 x64) Maxtor 250GB (Ubuntu 11.04 32bit/Program Files/Games) Hitachi 2TB(Storage) How It Fails: It will blue screen or freeze or restart(and not post afterward). It usually will not turn back on immediately, no post. If I wait a few minutes, then it will turn on, but soon after will fail again. How long before it fails seems to be proportional to how long I leave it off and inversely proportional to how far along the failure process it is. By this I mean that, after the first BSOD/freeze/restart, if I let it sit for 12 hours, it will stay on for ~7 hours; a few days later, though, if I let it sit for 12 hours, it will last ~1 hour. Freezes and restarts will happen at any point in the boot sequence, even idling in BIOS. Timeline: Went through the few-day failure routine. RMA'd motherboard. Worked for ~3 weeks, then went through failure routine. Advance RMA'd motherboard, so I got a completely different one. Worked for ~ 2 weeks, then went through failure routine. RMA'd and received new CPU. worked for ~1 week. After the start of the failure routine, I replaced the PSU with an Antec BP550W; this didn't seem to effect anything. Current Status I left the computer off for ~ 13 hours last night; it restarted(with no sequential post) after ~30 min. Possibly Helpful Info: The original motherboard was purchased open-box(yes, I've learned my lesson), but was replaced during the advanced RMA after the second failure. Each time it's failed, I've broken it down to just onboard video, CPU, RAM, mobo; it still would not turn on. Also tried different RAM with no luck. After it fails, It won't produce any beep codes, even with no RAM. Even when my computer is working fine with no BSOD/hard locks/restarts, if I tell the computer to shutdown, it will restart. The only way to turn it off is to hold the power button. The situation degenerates steadily over a few days from normal operation to no post. Something has to be breaking; I think it's the mobo and/or CPU. What's confusing me is that after I RMA'd either the motherboard or the CPU, I had a working computer for a couple weeks. So by RMA'ing the motherboard or CPU, something gets fixed, but, then by using the computer, this thing breaks. I considered the PSU to be the cause, but even after replacing that with one that should be able to supply enough power, the degeneration continues. Thank you very much for any help. This has been a 6 month problem; I desperately want to fix it.