IMac getting selective about what discs it will accept

I have a 17inch iMac Intel Core 2 Duo, running OS X 10.4.11.
Earlier today, I went to the Apple Store and bought the box set recommended to me for upgrading the system software to 10.6 (Snow Leopard).
The iMac's optical drive will not read the disc containing the Snow Leopard upgrade. To make sure that it wasn't completely hosed, I tested it with some other discs that I have. It was able to accept and read discs such as the one for SimCity and Civilization, as well as Microsoft Office and Quicken. A random sample of my audio CDs revealed the iMac will read them without difficulty. However, I observed that some of the DVD-ROMs that I have burned in the past to archive my photos are no longer accepted, nor will it accept a random sample of any of the commerically produced DVDs that I have.
In short:
Audio discs: OK
Data discs: mixed results
DVDs: forget it about it
Anyone have any ideas what might be going on?

I think den.thed is along the right lines with this being a possible hardware issue. Problematic drives are going to have problems with DVDs first, along with any kind of burned media. While your computer is relatively young it isn't unusual for superdrives (fancy name but basically a DVD drive) to start having problems after 4 years or so. You can buy a cleaning disc for about US $10 though I have not had much success with them. When my drive started failing I bought a new one (Pioneer drives are Mac compatible) for about $30 and replaced it myself in about 15 minutes. If you are so inclined you'll probably get input on that in this forum (I happened to wander in from the G4 tower side of things . ). One place to start shopping is [www.macsales.com] You can get an idea of prices and they have "upgrade" guides to suggest parts as well as videos on how to do it yourself.
One thing to consider though is if the computer is still under warranty in any way you might need to have it done by a certified technician. If it is not under warranty and you want to try cleaning it, I'd just get a disc and do it yourself. A technician will likely charge you more for the time than a brand new drive would cost you. I also can't think of a single case of many very similar posts on here where I have seen somebody report success with one of those cleaners (it must happen some time but I haven't seen a case).
Message was edited by: Limnos

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