New computer---problems

Just brought a new computer and im having trouble

Intel e8400
asrock penryn 650i
2gb crucial ballistic tracer
coolermaster real power pro 650w

A few days ago i was runing a 15% OC with no voltage adjustments. After 15% i was unable to post, even if i only upped the fsb by only 1mhz and increased voltages across the board. I later installed a few more fans inside the case to provide better NB and ram cooling and now i cant post with a 10% overclock. What the hell is going on? my computer is runing VERY cool and my ram is underclocked. do i need to RMA my MOBO?

Or maybe your particular processor only passed QC for 3GHz, you know, the speed it's supposed to run at.

Not exactly something any company will let you complain about.