Nook Won't Connect to PC

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http://forum.xda-developers.com – After trying out cm9, I grew tired of the poor performance and decided to downgrade to CM7.2. After a full wipe with TWRP, I can't mount the damn thing to my PC. I thought it might be a ROM issue, but I can't mount the usb in recovery in TWRP or CWM. I'm kind of at a loss now, because I didn't think wiping in recovery and flasheing a ROM could cause a problem like this. Also, the apps I've paid for in the play store appear under my lists of apps, but the store wants me to buy them again, any ideas? (HowTos)