My first problem was Kernel Power (random restarts) and now this, monitor turns off and fan speed sup whitin 10 minutes while playing any game. I think it's not overheating. The funny thing is that I have new monitor and new nvidia graphics card, but I used them with no problems for about a month. I noticed this problem 2 days ago. After monitor loses signal and fan speeds up (I don't know why) I have to do a hard restart. It might be a power supply issue but I'm not sure.