I'm also not a Linux expert, so I'll let other people speak on that.
For the power, I know there is no Molex cable anywhere. They uses industrial PSU and not standard computer one. So of course, you won't have a ready to use cable to plug in any adapter. But, the rear CD-Rom and floppy must have power since it's a 3.5inch IDE cable (without power) that goes to it. I found an old picture of mine where you can see the power cable. It is possible that the last user lost the adapter board to plug the floppy and drive, but the power cable should still be somewhere in the scope.
