Mac Pro froze now won't turn on

I plugged a usb cord (prom an Epson printer) into my 2008 Mac Pro, next thing I know everything is frozen. Turn off the Mac Pro now I can't get it to turn back on. I've unplugged it from electricity and retried, I've taken off the two exterior hard drives that were connected via firewire and the usb printer, nothing seems to be bringing this computer back to life. Any ideas or suggestions? The computer was working completely fine a half an hour ago.
thanks jeff

Ok got it back on after waiting 45 minutes (reading every post on the internet I could find on the subject) I had reseated each module of ram (testing one pair at a time), each hard drive.
As for the Apple Hardware test I can't find it. I purchased the family license (5 machines) of Snow Leopard (from Apple) and only received one DVD - I have a special CD case for these DVDs and I know I didn't lose the other. I've tried to restart it both with the instal DVD and without the DVD holding the D key and neither way brings up the Apple Hardware test or any language page.
I've rebooted holding the C key and run the repair permissions on the boot drive from the install CD. I've zapped the Pram the front light is on now full not blinking nor has it ever blinked during this ordeal.
Any suggestions on my next course of action as I know the problem has not been fixed and will come back when I need to work?
Thanks, jeff

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Mac Pro froze now won't turn on

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