This problem started a few days ago. I have been working with a geekstogo helper to find possible malware (turns out I don't have any). I thought it might be related to what we were doing, so I asked him about it. He wrote: "Sorry, I'm a Malware guy, not Hardware. Perhaps querry someone on the Hardware portion of the board." I have Windows 7. I have my "Turn off the display" set to the default of 10 minutes. It has happened at least twice over the last couple days that I cannot wake the monitor up from sleep. I do the usual - click the mouse, press some keys - and it doesn't wake up. I have seen no alternative at this point except to power off the PC and power it back on.