For the past year or so, about 30 seconds or so after I boot my system and get to windows log-on, all my monitors black-screens for about 5 seconds. After that nothing happens at all before I boot my pc again. I suspect it has something to do with my GPU, and have tried to find the error in Event Viewer, but so far have had no luck. Can someone help with event viewer codes, or shed light on where GPU issues would appear in there?