Well, I don't know how that happened,
but I know it wasn't this rom specifically. I've had no issues like that with Entropy's kernel either. First, I'd try holding down the power and volume down buttons for 20-30 seconds to force it to reboot into download (maybe it just got stuck?). See if the computer detects it even without showing anything on the screen.
CWM shouldn't even be able to keep you from getting to download mode - the only way to do that is to corrupt the bootloaders, and if that happened you should be able to get back with this tool
. Beyond that, I don't think there's anything else I can do to help you.