Hi Darthnite
Welcome to the forum
Well first of you dont have to worry about the HD yet. Remove you're GFX card and RAM then seat them properly. Then Remove you're CPU fan and CPU and replace it properly. Make sure you have enough grease on the back side of the CPU/ Heatsink.
I know you might not have removed parts from the mobo but things might have goten loose when the transfer took place. Its eighter you're RAM or GFX card. Worst case scenario its broken. But lets noot get ahead of ourselfs.
Do that and lets check it out
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