Quoth Eireann
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If you're thinking of reusing the case and power supply from your HP, don't. HP cases aren't quite standard that way and can require significant modification, and the power supply won't be adequate and may lack the right connectors.

I AM the evil bastard!

You might wanna grab a tube of heat sink compound (the smallest possible, you only need a drop), or ask whoever helps you with the assembly for some. It's used to cement the CPU/APU onto the heat sink and fan, and it helps to more efficiently conduct heat away from the CPU.
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