What is causing my computer to continue running after shutdown?

oomwoc

Honorable
Jun 10, 2012
6
0
10,510
Hi,

The hard-drives, fans, CD drive, etc. continue to run after I shut down my computer. I'm assuming it is the motherboard that is causing the problem, but how can I be sure that the power supply isn't faulty?

I've already made sure it's not the operating system.

Motherboard: ASRock Z77 Extreme4

Power Supply: OCZ ModXStream Pro 600W

Thanks!