Not much can be done with such. I toss the CD Lens cleaner into such just to be sure that some dust hasn't landed in the wrong spot.
After that, phone calls for prices on repair or exchange and if in the warranty, that avenue.
I Have a portable DVD player that will not play any DVDs. I was on a road trip and watching the disc set "Band of Brothers" and when I went to resume a disc after powering off it would not play....the disc would run and eventually state "INVALID ENTRY" Every DVD I play now says "INVALID ENTRY" However, Audio CDs and MP3s still play. Is there any way to fix this without sending it in and having to pay $170 or more?