john dowler, I would suggest a reset:"if you are able to turn on the Tab
Factory data reset
Use Factory data reset to return your device to its factory defaults. '''This setting erases all data from your device''', including your Google or other email account settings, system and application data and settings, and downloaded applications. After a reset, you’ll be prompted to set up your device the next time you turn it on.
1. From the Home screen, Settings, Privacy. (check the box "Back up my data", Un-check the box "Automatic Restore", this can be checked again after the reset,
but may restore the settings/data that was causing problems)
[best to restore things one at a time & check to see if the problem has returned]
2. Touch Factory data reset, then follow the prompts to perform the reset.
If you are unable to turn on tab
Hard Reset
This setting '''erases all data from your device''', including
your Google or other email account settings, system and application data and settings, and downloaded applications. After a reset, you’ll be prompted to set up your device the next time you turn it on.
1. With the device off, press and hold Volume Down and Power.
2. Release the Power button when you see the Samsung logo, but continue to hold Volume Up until the recovery screen appears.
3. Use the Volume buttons to navigate the menu and select wipe data / factory reset. Press Home to choose the selection.
4. Press Volume Up continue.
The Galaxy Tab should then go through the hard reset process. from [http://www.thegalaxytabforum.com/index.php?/topic/5272-todays-gtab-did-you-know/page__st__20__p__28971#entry28971|here.] Hope this helps, good luck.