On shutdown, display turns off but computer doesn't

When I shutdown my computer my display turns off, so I am guessing that my graphics card shuts down, but nothing else shuts down, and I am forced to manually shutdown. I have tried to clear CMOS, as I have had this problem before and fixed it for a while by reverting back to default BIOS settings because I had an overclock, but it has come back again.

Maybe this is the problem?

Dude said:

When you cleared your CMOS, did the date go back to an older date? I have heard of ASUS having a bios bug causing that, but have found nothing on ASROCK. Do you have the latest BIOS version?

Yes I have an ASROCK mobo and the latest version. Not sure about that older date, but this problem was occurring even before the CMOS clear.

Dude said:

Reseat the 24 pin connector on your motherboard, and the video card power cables.

Haha, I think I may have found the problem. The 4 pin on the 24 pin connector wasn't plugged in
It must have come out somehow, I'll test to see if the problem still occurs, thanks for your help.

Dude said:

You're welcome, hope that is it.

Was shutting down normally for the first few days, but the problem came back again.