Originally Posted by homestyle
The cable will fit in the space between the motherboard and motherboard tray, but isn't in dangerous to put the cable in there.
I saw a lot of metal pins on the back of the motherboard and I could short something.
Well, as long as you don't force it down. There should be plenty of room if you "flatten" out the cable a bit. Mine is a HX520, so I have the cable sleeved. Between that and the wires insullation, I have no issues.
If you want to do it, I would examine the bottom of the mobo. There are some areas where the pins and solder are "higher" than others. If you plan a routing and tape the wire down to the tray before installing the mobo, you will be fine.
edit: Really, if it is something you are not comfortable doing, get an extension. I would hate to see you blow up your PC due to my advice