Hey all, I have a refurbished mac pro that I got from Apple, see below on details, and I powered her up today and I got no video. This has happened before, but after a restart, it usually fires back up, but this time there's no image/video from the Mac Pro. I checked the monitor via my Mac Book Pro, it's good, the cable is good. I also did a firewire target mode via the Mac Book Pro to see if the 4 HD's in the Mac Pro are working, and they came up on my Mac Book Pro just fine, at this time the monitor also did not display the firewire logo on the screen as it normally does? Next I tried to insert the Apple provided disk to run from CD-Rom to bypass the HD's but no video, at least the keyboard works. I also opened up the door on the Mac Pro, made sure all HD bays were secure, used a air can to remove a little dust, check RAM slots and their secure, and don't know what else to do? Any thoughts? Thanks.