I have a rather new custom built pc with an asus mobo (6 months).
The computer has issues waking up after hibernation. The power button refuses to wake the computer after hibernation/sleep mode from Win 7.
The only way to get it to start again is to pull the motherboard power cable (the cable that runs from the PSU to the motherboard) out and plug it back in.
Is this a sign of a bad power supply or is it a sign of a bios issue as described in this thread: How does hibernation work?