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Had this problem in the past. Shut-down. Open the CPU tower (case). Clean out all the dust-bunnies and pay particular attention to the power supply area. Unplug and replug all cables to the DVD and CD drives. Restart.
The power supply cannot provide the proper voltage to the DVD/CD drive if it is overheating even slightly due to dust, and cable connections will film over with corrosion over time. It’s worked for me on two occassions of having the same problem. Should be a simple maintenance job. Cheers – bobbmtn