Had computer in shop and after they installed a new hard drive and power supply it worked fine there. when i set it up at home the keyboard and mouse weren't recognized. i unplugged both, checked batteries, changed keyboard and mouse with older ones but nothing. had to keep hitting restart button to restart and a window popped up wanting to install video stream. without a working keyboard or mouse I'm at a loss as to where to go from here. i won't be able to return the CPU to the shop until Monday and they already had it for 12 days telling me the registry was corrupted/bloated and it needed a new hard drive & p/s. they built it for me 4 years ago and i've had very few problems. any suggestions?