Ask the Doctor: A Two-PSU Kind of Day

My Tagan TG900-U96 Turbojet 900-watt PSU recently burned out. I returned it, but it was no longer being supported through the third-party vendor I got it from. The vendor sent me an Apevia Warlock 900-watt PSU to replace my Tagan. I swapped it out, but now when I turn on the computer it won’t boot all the way. I get power lights, and the keyboard and mouse light up, but the monitor never kicks on, nor do the other connected peripherals (external Zip drive, printer, and scanner). What could be going wrong with my computer? I never had this happen with the Tagan. Could something have been corrupted when the original PSU died? —Ben Locke Click for Ben's answer, after the jump! read more (link)