drives not found

[patolndlx3]

i installed a power supply, i just turned it on and it loaded saying boot drive not found insert disc. i restart and this timme i hit F1  for help and i noticed under my drives such as slave drive and all those it said "none" so i was wondering if any one off hand knew what i did wrong or what i need to do to fix this. thank you for your time. 

[patio]

Double check the data cable connections to the hard drive and the MBoard...you may have dislodged them hooking up the PSU.
If it's an IDE drive then its a flat grey ribbon cable...if SATA a 1/2 inch wide cable...usually red.

[Kurtiskain]

See if you can possibly change these to auto, or push enter on them, and re try an auto detect.