Hi all, Got a completely random and rather irritating problem. I don't believe it's OS nor driver related, and literally just did it then whilst typing this out. It can happen several times a day (like today), or can go for weeks without showing up. I'll be working away doing whatever (browsing net, playing a game, anything), and the primary monitor will go completely blank. No "error", or nothing. Nothing in Event Viewer either. So far I have: Swapped over the monitor HDMI cables - same problem. swapped over the monitor HDMI ports (HDMI1 to HDMI 2 on back of monitor) - same problem. Swapped over power bricks for monitors - same problem. Swapped physical monitors - Waiting to see if same problem. Anyone seen this sort of problem before? In addition I have two identically setup Samsung 24" LCDs, and yet somehow one has a far brighter more vibrant picture (my primary monitor which has this black out issue). Anyone seen that before? Thanks for any replies.