4yo build, light use. Out of nowhere power on causes pulsing fans & power light instead of boot. On ~2 sec, off ~3 sec. These would go on indef. Like boot is aborted but keeps repeating. I first thought W7-64 sleep issue. But disconnect drive, no change. Reset CMOS & keyboard del, esc, f2 etc on restart, ditto. I know final proof is mobo w diff ps, or vv. But maybe someone else has = experience & which it is. TYiA.