Mac Pro (early 2008) 2.8 GHz Quad-Core Intel Xeon - Was working but has sat unused for about a year.
When I recently booted it up it seemed to be OK, but after about 10 mins. the screen goes black. Has El Capitan installed. I have reset PRAM and SMC but did not fix. I have also tried another monitor but screen still goes black. I suspect it's the GPU - ATI Radeon HD2600 XT 256 MB? Is there any way check the GPU?
Mac Pro, OS X 10.11
Yes, a possible way to check if the GPU is causing the issue is to boot the Mac Pro in Safe Mode. To do this, restart the computer and hold down the Shift key until you see the Apple logo. If the screen stays on in Safe Mode, it might indicate a software-related issue with the GPU.
Are you actively using the mac when the screen goes black? Pressing a key or moving the mouse does not activate the screen? Is the mac still working, just not displaying? Is it turning itself off?
I booted in Safe Mode and the screen rippled with 3 waves before the login window appeared. After logging in the screen went black after a few minutes. If I reboot the screen will again function perfectly for about 10 mins. then goes black. Thanks
I opened the activity window and the console to view, pressing keys and mouse will not activate the screen. The Mac seems to still be working and does not turn off. If I reboot the screen will again function perfectly for about 10 mins. then goes black. Thanks
if you are still using the original replaceable display module that shipped in your Mac, it has had a remarkably long life. The original cards got beastly hot despite their fans, and burned them selves up.
Do NOT replace it with an identical card. There are far better used cards available. But any card you buy needs Mac firmware on board, or it will not show boot screens or diagnostic, Recovery, or safe mode screens.
The 5770 is a good common replacement, and runs cooler. Drivers first shipped in MacOS 10.6.5 so anything after that works great.
<< I have also tried another monitor but screen still goes black. >>
¿are you saying the External screen go black?
is this the 13-in or the 15-in version of 2008 MacBook Pro?
It's a Desktop Mac Pro (early 2008) 2.8 GHz Quad-Core Intel Xeon, using a 23" Cinema Display
Thanks
Mac Pro (early 2008) Display screen goes black
