ipad frozen unable to access anything cannot restart it

Try a reset:

Hold the Sleep and Home button down for about 10 second until you see the Apple logo.

Reboot the iPad by holding down on the sleep and home buttons at the same time for about 10-15 seconds until the Apple Logo appears - ignore the red slider - let go of the buttons.

If a reset doesn't work, you'll have to force the iPad into Recovery Mode (Note: Data will be lost)

1. Disconnect the USB cable from the device, but leave the other end of the cable connected to your computer's USB port.

2. Turn off the device: Press and hold the Sleep/Wake button for a few seconds until the red slider appears, then slide the slider. Wait for the device to turn off.

3.While pressing and holding the Home button, reconnect the USB cable to the device. The device should turn on.

4. Continue holding the Home button until you see the "Connect to iTunes" screen. When this screen appears, release the Home button. iTunes should alert you that it has detected a device in recovery mode. Click OK, and then click Restore to restore the device.

What to Do When Your iPad Won't Turn On

http://ipad.about.com/od/iPad_Troubleshooting/ss/What-To-Do-When-Your-Ipad-Wo-No t-Turn-On.htm

iOS: Not responding or does not turn on

http://support.apple.com/kb/TS3281

iPad Frozen? How to Force Quit an App, Reset or Restart Your iPad

http://ipadacademy.com/2010/11/ipad-frozen-how-to-force-quit-an-app-reset-or-res tart-your-ipad

iPad: Basic troubleshooting

http://support.apple.com/kb/TS3274

Update and restore alert messages on iPhone, iPad, and iPod touch

http://www.buybuyla.com/tech/view/012953a0d412000e.shtml

iOS: Resolving update and restore alert messages

http://support.apple.com/kb/TS1275

iPad: Unable to update or restore

http://support.apple.com/kb/ht4097

 Cheers, Tom 😉