my ipad will not turn on

Assuming that the battery isn't empty (and it can take up to 15 minutes of charging before it will respond), then have you tried a reset ? Press and hold both the sleep and home buttons for about 10 to 15 seconds, after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.

This didn't work for me. Any other suggestions?

DOES NOT WORK IPAD 4 COMPLETELY DEAD. IT WAS CHARGE TO 100% TRIED PLUGGING IN THE ELECTRIC CIRCUIT TRIED HARD START UP TRIED REBOOT FROM ITUNES NOTHIN. I HAAVE IPAD ONLY SINCE 11/27/12 COULD THE BATTERY BE COOKED?