An ongoing issue for some people who have installed Mountain Lion is the inability to access their systems' internal optical drives. Once installed, inserting a disc results in a couple of noises before the disc is ejected. While this can sometimes happen for burned discs that are no longer readable, it appears to happen for all discs, be they home-burned or commercial.
If this is happening on your system, first try testing the problem with multiple operating systems to see if the problem is hardware or software based. If your system came with gray boot discs, try inserting them and … Read more