UPDATE: In a fit of rage, I completely uninstalled PT. After realizing that was a stupid thing to do, I reinstalled PT and some-****ing-how my chassis and cards are all recognized and test successfully in Digitest! Thankfully, I am back to the original problem I was having in my first post: Computer still crashes when trying to enable anything more than 1 DSP in PT! Yet when I run Digitest, it says all my cards come back successful!
Chris, I think you might be right in testing the cards one at a time. Gahhhhh. I should have tried this the first time but I was convinced the problem was somewhere else. I am doing this tomorrow. Hopefully it's a flex cable like you suggested or a bad card.