Run cords behind the mobo tray if they aren't needed.
round ide cables
I run everything behind the mobo tray then pull it back outso there is no excess.
keep things at 90 degree angles flat on surfaces.
As far as the DVD drive, you could try a different power plug on the PSU, but it looks to be DOA.
EDIT: here's my computer (one of them). It used to be like what you are describing. Patience.