So I have a Mac Pro that is 1 yr old that suffered cosmetic damage in a shipment 8 months ago. Although the chassis suffered damage, the computer has functioned just fine for me over the last 8 months. After waiting 8 months to find a good deal on eBay, I finally was able to obtain a replacement chassis. So then began the transfer of Mac guts from one metal container to the next. I'm quite anal-retentive, and feel confident that I re-assembled every screw where it was, every molex connector to where ii was connected, etc.... but get absolutely nada when pressing the power button...... it's actually very scary! The only form of life I even come across is a very very faint tick (approximately in 1 sec intervals) from the PSU whenever the power cable is inserted. You can only hear it if you have your ear right up to the thing. Is there anyone out there that has any pointers/direction on where to even start troubleshooting. I have a meter all ready to go, but don't know even where to start. I am seriously hoping it's something simple in the wiring pathway from the push button..... yikes! pray for me!