[Q] Bootloop after flashing TWRP. Please help.

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http://forum.xda-developers.com – I was on locked on stock OTA JB. I unlocked a few days ago, then last night flashed TWRP. Created a nandroid, then rooted. Today I've spent several hours downloading ROMs, doing Titanium backups, surfing forums, backing up my personal files etc. i.e. using my tablet normally without problems. I decided it was time to flash a ROM so booted in TWRP to create a fresh nandroid. Then when it finished I rebooted the system with the plan to copy the nandroid to my pc. The tablet booted, but then after 30s or so rebooted. It's now stuck in this boot loop. So I tried a cold boot, and then resto (HowTos)