my iPAD refuses to start afterupgrade to iOS 7.0.3?

First thing to try is to reset your device. Press and hold the Home and Sleep buttons simultaneously until the Apple logo appears. Let go of the buttons and let the device restart.

If that doesn't fix the problem you might have restore the iPad in iTunes on a computer.

Frozen or unresponsive iPad

Resolve these most common issues:

• Display remains black or blank

• Touch screen not responding

• Application unexpectedly closes or freezes

http://www.apple.com/support/ipad/assistant/ipad/

iPad Frozen, not responding, how to fix

http://appletoolbox.com/2012/07/ipad-frozen-not-responding-how-to-fix/

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

Black or Blank Screen on iPad or iPhone

http://appletoolbox.com/2012/10/black-or-blank-screen-on-ipad-or-iphone/

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

Home button not working or unresponsive, fix

http://appletoolbox.com/2013/04/home-button-not-working-or-unresponsive-fix/

Fixing an iPad Home Button

http://tinyurl.com/om6rd6u

iPad: Basic troubleshooting

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

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

iTunes: Specific update-and-restore error messages and advanced troubleshooting

http://support.apple.com/kb/TS3694

 Cheers, Tom 😉

I have the same problem; but how to restart iPad by using my computer?