Black screen in iMac 27" - 2011
I have an imac 27 "core i5 of 2011 Model A1312 (EMC 2429), I recently started with a black screen while I'm working. The computer is still operating, but I can't see anything. I stop using it until it stops due to inactivity, I press a key and the black screen It disappears and I see the desk with the task I was doing. After a few minutes the black screen returns.
Any solution?
Thanks in advance for the possible help.