When i booted up the mac pro it turned on the hard drive booted but when i looked at the monitor it was blank. I didnt get any of the components because it was just the computer. It had a monitor jack so i could plug in a regular pc monitor. it seems to be in good condition and i dont want to make a trip to the mac store with this gigantic piece i was wondering if anyone had an idea of what this issue might be or whats causing it to not show on the screen?