I think maybe the metal part of the pci of the graphics card might be touching the motherboard, but I'm not sure, since it's so cramp I can't really see. So I want to ask you guys if it's okay to turn on the computer. I know I got it pass the motherboard though, but I know the motherboard was about to touch the back of the case, so I really don't know.
The front panel connectors will usually all have a common color wire such as white or gray. This will be the "common" or (-) wire. There is no standard for this unfortunately. I have seen some recent cases where all wires were black.