The lights are on
I recently bought the new slim model, regardless of how the disk slot operates. The system itself works really well. Really quiet when the game is loaded up and it dosen't overheat at all. The disc drive seems to be the loudest when you insert a game, but once the game boots up ; quiet as hell.
If your current model is dying as it looks like from what you're posting, then your best bet is to buy another console. Either Slim or super slim models work fine in terms of performance.