MP All Models Mac Pro 2008 shuts down randomly & fans go full blast

[sparkie7]

I'm hoping someone can help me out here. My Mac Pro 2008 (running El Capitan 10.11.6) randomly shuts down for absolutely no reason.

- screens (3x 30" ACD's) just go black and fan kicks on full-blast. (not sure if it's just the heatsink/ram fans, or also the video card fans (two of them) as well, as it's loud – fans going at 100%) – have to manually restart

 

[chscag]

Sounds like your video card is failing. That will cause a shut down and send the fans into high RPM. Do you have another video card that you can swap to see if that's the problem?

 

[sparkie7]

You could be right. Sometimes when I wake the machine, the centre or right screen stays blacked out unless I sleep and hit the keyboard to wake and then the screens all come on. I'll check tomorrow if those two displays are connected to the one video card