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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.
If that didn't work, then try to restore it from different computer.
Let me know if that didn't work, so we can continue troubleshooting. Don't Rate my answer until you are satisfied.