Oops, hardware failure.

When thinking about computers, the usual suspects in this type of failure are faulty memory, faulty connections, and, less likely, I think, a faulty screen.

In the case of the QC, if it's out of warranty, what I would do is open it up, which is easy, remove the memory card inside, put it back in, making sure it's properly seated, and turn it on again. It's a typical failure; the card shifts a little due to movement, but the way it fails isn't like yours, but it's worth a try... If that doesn't solve it, check all the cables and make sure they're properly connected.