I just built a new computer. I am using my old case (from an hp elite), power supply, and hard drive. Everything else is new including the mobo and processor (i5 2500k). I put the whole thing together (it appears everything is connected correctly) and it wont power on. It simply does nothing. Right before i installed the new stuff i had turned the power supply on and off quick a few times. Do you think i should return the mobo or get a new PSU. Also is it ok to use the hp elite case with this new build? Any advice will help! Thanks!