OK, I noticed this problem about a week ago when I was playing a PC game. Just all of a sudden, my PC completely turned off (mouse light, keyboard lights, and power light were still on). The only way I could turn it back on was by holding the power button for a good 5 seconds and turning it on. At first I thought it was the game causing these problems but it happened a few more times while I was randomly doing things on the internet. Whenever I turn the PC back on, I don't get any type of error message so I have no idea what's the problem. It would be a big help if anyone knows a soultion to this problem. Thanks.