I have a Mac Pro bought in august 2008. 2.8GHz Quad-Core Intel Xeo. Graphics Card NVIDIA GeForce 8800 GT 512MB. 10GB RAM. OS 10.7.5 Lion.
I use two external displays. One using DVI and one using VGA.
All of a sudden when I was using the computer both my monitors just went black, completely dead. The computer remained turned on. I was unable to get the video back to the screens so I forced shutdowned the computer by holding the power button pressed 10 seconds.
When I turn the computer back on, both my screens remain black, completely dead. The computer seems to be booting though, the fans start and the light is solid white. There is no start up chime sound (I think I heard it once though...but I´m not sure)
This happened yesterday so I have tried to boot the computer after a night with all power cables removed.
After some reading on the Internet I tried to change the CR2032 battery cell, with no success.
The graphic card seems to be intact...by the look of it. The fan is spinning.
I´ve tried both monitors with another computer and both monitors are working perfectly.
I´ve tried to boot from bootable usb and it didn´t work. I then realised that it seems like the computer is unresponsive to any keybord inputs. I am unable to open the DVD and enter a bootable disc. If I press the Caps lock button on the keybord the light on the keybord doesn´t turn on, so maybe the computer has no contact with the keybord?
I would appreciate very much and be very happy if someone could help me with this problem.
Is is something wrong with my graphic card? what could be the problem?