Fix - for GTab won't turn back on

There is a reset button, but you have to crack open the device to get to it. I'm serious. This is a known issue with stock (and I assume TnT Lite 1.x is also affected, going on what you've written) - I've had this happen myself and I've called CS about this, already.

imo, you have three options:

1- Wait for the battery to die and it might "fix itself" (stress the "might" part). The device is definitely on, in this sleep mode that you can't get out of. I know this because when it happened to me, the device was recognized as a USB device when I connected it to my system and ran "lsusb" (Ubuntu). Second, when I first cracked my device open, I could see a green light inside so that told me it was actually on and drawing power.

2- Crack it open and hit the reset button in the middle of the board - this will most likely fix it immediately, but as you may expect it will void your warranty. There are four screws behind the rubber feet that you have to take off, and a bunch of clamps around the device that you'd need to pry open with something like an iPod plastic prying tool. It's a bit of a PITA to open and you have to be careful.

3- Return it / exchange it. Of course, all your data is there so hopefully there's nothing you care about or stuff that's confidential.


EDIT: The battery should drain completely within 24 hours. Once that happens, you can use the power button again to start it up and then you'd want to connect to AC to recharge, of course.

Source: XDA