Mortherboard problems no display

Hi everyone kinda new to this forum, anyway i recently upgraded my case and heatsink and when i went to pop eveything back in there is no display. So i have tested my PSU by switching one out, tested the ram and rest the cmos. My gpu is fine because the fans turn on and everything. I have came to a conclusion either its the motherboard or cpu, but what do you guys think. I noticed also that my cpu does ot get hot (only about room temp so maybe its the mobo not powering it).

a4 5300 apu
asrock fm2a55m-dgs
PNY 4x2 gb
some oem psu
hd 7750 msi oc edition
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