I purchased several items on Mercari intending to try repairing them, but I don't have the time to do so, so I'm listing them. When I turned it on, it started up properly. However, the disc doesn't spin when I insert a disc. I also opened it up, but it's complex and I don't understand what's going on. I can't handle it as a novice. Is anyone who can repair it interested? This is the main unit only, and the HDD is included.