I have an old Dell Dimension 8300 computer I'm using for the time being while I wait for my power supply to come in on Tuesday. I took out the CD-drive and the DVD-drive and put it in my new build. Now, the old Dell will not start. I made sure everything was plugged into the hard drive and motherboard. It all checks out good. Am missing something? Power to the CPU, CPU fan, 20 pin motherboard connector, and hard drive are all in place. The computer will boot and I get a screen that says no drive found. It worked ten minutes ago before I pulled the optical drives out.