Won\'t read pressed discs... (Matshita UJ-850S)

[qanda]This thread is about the Matshita UJ-850S. Click here to see full specs[/qanda]I have a Matshita UJ-850S dvd-ram drive. I recently tried to play a game that required a game disc in the drive to run the game. When I put the disc in the drive, nothing happened. I went to explorer, and it didn’t register that there was anything in the drive. I tried several pressed (retail as opposed to burned) discs and none of them work. But when I tried a burned disc, it worked just fine. I have no idea what could cause this problem or if it can be fixed. Can anybody help me???

You have a crappy Mat[B]shit[/B]a drive.
I suggest cleaning the drive/lens with Isopropanol & a q-tip if possible.