Apple Bluetooth Keyboard Not Connecting

Hello,

I have an iPad 3 (model MD340LL/A) given to me by my school and the standard Apple Bluetooth keyboard. Last year, I used the keyboard with my iPad without a problem. However, my school collected our iPads over summer and did a software reset on them and set them up with their own system (a few standard apple apps are disabled). Since I got my iPad back, my keyboard will not connect to it. The iPad is physically the same one I had last year, but the software was reset. When I press the power button on the keyboard, the light turns green for around 3-4 seconds and then turns off. It won't go into discoverable mode where the light starts flashing. we have tried connecting it to my dad's MacBook, and it sometimes shows up while searching for a device, but any attempt to connect to it ends in a pairing unsuccessful message. How can I get my keyboard to connect to my iPad? The iPad is on iOS 7.1, and I know that none of my school's changes to the iPad should affect my keyboard, since they haven't changed from last year when they worked fine.

Thanks,

Nihar