2010 Mac Pro Monitor not working

[osxabsd]

I have a Mac Prod 2010 with a ATI Radeon HD 5870 1GB card and a 27inch apple disply. When I power it on I get no video. The keyboard connected through the monitor appears to work (i.e., control-eject-enter can shut down the machine) When I connect the monitor to a Mac Book Pro the monitor works, likely eliminating the monitor as the problem.

Is the anything else I can try other than having Apple look at the video card?

Thanks

 

[minifridge1138]

Try another monitor.
Try using a different port on the Video Card.

 

[DanielCoffey]

Are you still under AppleCare? If so, it is a no-brainer. Take it in.

 

[digitalhen]

Try another monitor.
Try using a different port on the Video Card.

Indeed. I've found the sockets on my card to be quite fussy. While appearing to be fully inserted, I got no graphics on the screen. Re-inserting the cable resolved it.

NB. The keyboard is connected via the display's USB hub, and will most likely work without the display itself being connected to the graphics card.

 

[osxabsd]

Thanks for your response.

This problem started after I had been away for a week (the machine had not been booted).

I tried:
1. Using different ports.
2. Checked the monitor with a Mac Book Pro and it worked, eliminating the monitor as being the issue.
3. I replaced the 16 of memory with the 3G of factory original memory.

Then I opened a ticket with Apple support, and when I tried recreating the problem for them I never could, even though I did recreate it several times previously. So at this point, the problem magically went away.

I have a hypothesis that it might have had something to do with the internal battery since the machine had not been booted in a week.