I have been using Widows 7 for over a year without incident. Up until a few days ago the power button and wake from sleep all worked normally, but not anymore. Please tell me how to trouble shoot this. I am using Windows 7 Home Premium Service Pack 1 Processor: Intel Core i3-2105 CPU @ 3.10GHz 3.10 GHz Installed memory (RAM): 8.00 GB (7.73 GB usable) System type: 64-bit Operating System Mother Board: ASRock H61M/U3S3 LGA 1155 Intel H61 HDMI SATA 6Gb/s USB 3.0 Micro ATX Samsung SSD 840 C:30.9 GB free of 83.8 GB D:12.5 GB free of 15.6 GB Here are the symptoms: When I "Shut down" and then press the power button, nothing happens. Here is how to turn on my PC: Flip the power supply switch, press the power button, wait 3 minutes, press the power button again (Windows boots). If I "Restart" from the Start menu, Windows immediately reboots like a normal Windows machine. Keyboard and mouse no longer wake the PC. Here is how to wake my PC from sleep: Flip the power supply switch, press power button, wait 3 minutes, press power button again (PC fan comes on but screen says "no signal" and power button does not turn off PC), flip the power supply switch, press power button, wait 3 minutes, press power button again (PC wakes up and screen says "Resuming Windows"). These are not extra steps, I spend hours stream lining the boot and wake up process much as possible. I performed a clean boot as described on http://support.microsoft.com/kb/929135 but it changed nothing. What else can I trouble shoot? Thank you.