Another bricked one, no bootloader menu, backlight loop

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http://forum.xda-developers.com – I had JB, rooted, unlocked and stock recovery working just fine. I forget the update file in sd card and accidentally go into recovery mode. Screen went black. Backlight of the screen is going on and off every 30 sec. Forced to reboot, boot logo comes up, after a few seconds screen goes black, and backlight of the screen goes off and on and off again in a continuous loop. No bootloader menu, no adb no fastboot (tried every combination). I can't even turn this thing off. My only hope is nvFlash i guess, But no good for TF300s for now. (HowTos)