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You have to restore your iPad from iTunes on your computer. You can restore it by putting it to DFU (Device Firmware Upgrade) Mode. DFU Mode is a mode which will allow you to restore your iPad to working condition. Put your iPad to DFU (Device Firmware Upgrade) Mode and restore it from iTunes. Follow the steps below to put your iPad to DFU Mode;
Note : Put it to DFU Mode while connected to computer and also in DFU Mode your iPad will remain blank.
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In DFU mode the screen will be blank. Try again...remember timing is important when you put it to DFU
If that didn't worked, then connect your iPad to your PC and then hold down both buttons until it shows a USB cable pointing to iTunes icon. Then open iTunes on your PC and restore it.