I've been trying to run the live DVD version of BT4 for the past few weeks, and it always comes back to the same problem:

SQUASHFS Error Unable to read metadata cache entry
So I tried the beta version of BT4 with similar results. It didn't show the error, it just would start loading the hardware drivers, then stay there indefinitely. Then I tried the BackTrack 3 final Live CD and this time I would just get a black screen after the initial loading screen. It would say "Ready," then change to a black screen and then nothing would happen.

I tried other Linux live CDs including Knoppix and Ubuntu. Both loaded just fine. So I realize it's a combination of my hardware and something inside of BT4 not getting together. I have checked the md5 hashes of all three and all three are correct. Is there anyway to narrow down what the problem is? I don't mind removing a piece of hardware temporarily while I run BackTrack if that will make this work.