I have an old-ish MSI A55M-P33 and A4-3400 laying around so I decided to see if it works, bench it, then sell it. But when I tested it, it didn't post, but the CPU fan was spinning. Nothing came up on the monitor, and there were no post codes. I tested it on an FSP 500W (tested, fully working), with a single 8GB stick of DDR3 1600MHz ram(from my personal system), with and without the ram. At this point, I'm pretty sure the mobo is dead, but still wanted to check.