reply to Action_Man
Re: [motherboard] Motherbaord help please ... It may or may not work. I have seen many systems with only one 12V leg plugged in and it worked fine and I have seen systems where it wouldn't POST without both legs.
Typically the 4pin or dual 4pin plug provides power to the CPU so you may have poor performance if the correct power isn't there when it's needed.
The 6 pin connector is (likely) for a video card. It is not compatible with the 12V 4/8 pin slot. Don't even try to jam it in, the molding should prevent it from going it but don't force it. You could fry the board and/or possibly the CPU if you get that in there & fire it up.