[Stonecutter]

Try a lens cleaner. If that doesn't work it still might be the discs.

One option you have I take ZERO responsibility if this ****s your games up is to boil the discs for 5-10 seconds.

You can find tutorials online about just how to do this and why it helps.

And option 3 is to send it back to MS. Which will wipe your hard drive at best and run you 100$ at worst (depends on your warranty status)

Or if you've got an in store warranty just say that your system is ****ed and pick up a new one for free.