This was an HTPC build, but in mini ITX tower.
Make sure install in this order:
- HDD(2.5) beside motherboard
- Motherboard with pre-installed CPU/RAM
- CPU Cooler After removal of 140mm Fan(then you can re-attach the fan)
- PSU after you finish cabling everything that needs power! (if you attache it first...you'll end up removing again)