SOURCE: Mobits A221 tablet pc reset
You can forcibly power off the unit in exactly the same way you can any PC, hold down the power (on/off) button for 6 seconds.
Technically it's actually 4 seconds but 6 seconds gives you a margin of error.
Unfortunately Microsoft make poor quality products and Windows XP Tablet Edition is no exception, Keep a a note of this procedure as this won't be the last time you need it.
Take it back to the generous person who gave it to you and ask her to try hard to remember the password or to unlock it for you so that you can change the pattern. Or contact the manufacturer's service center.
I have had the same issue with this tablet. After weeks of looking around on the net i have found a way to reset the tablet to factory settings when the power and vol down button will not work.
1. Download the firmware from the proscan website. http://www.proscanvideo.com/item.asp?itemnmbr=PLT8235G.
2. unzip the file and copy the files update.zip recovery.img and factory_update_param.aml to an external micro sd card.
3. Plug the tablet in and insert the sd card. Press the power button to see the battery icon then press the power button 5 times. Then let it run for 4 minutes and it should be set back to factory settings.
****NOTE***** If it fails to update then you still have the access to the recovery menu where you can do the factory wipe and still reset it.
Hope this helps.
SOURCE: I have a nobis Tablet.I tried to do a hard reset
guess is that the float level is not closing (need to open float bowl and clean everything inside with carb cleaner. Confirm that the float is operating (up and down) . Reassemble and try again...should be fine.
contact vendor mfg - shoulds be under warranty
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