Interesting that a faulty power supply was actually preventing the PC from STAYING asleep. I could understand if it was shutting off by itself but waking up??? I'm going to install the flirc on another PC tonight and see if it has the same problem.
I am having the same exact issue. This is VERY frustrating. I took all the same steps as paperw8. Including checking Allow this device to wake the computer in flirc's (the keyboard) power management. I read that a usb extension cable may have caused the problem which was my scenario to begin with however I disconnected it and plugged the flirc directly in multiple USB ports with no success.