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?

I never intended to make an issue out of it with intel. I have no reason to believe the processor is bad. But my MOBO is built for overclocking and that is my main suspect at this point