Major Problem - A Key landed on my ramps board

OK, yes, this isn't exactly a normal problem, but it is very strange.

A metal key was on my ramps board (my board is attached to my printer enclosure on the outside so I have no idea how this key got there.
It was sitting next to the wires connecting the LCD screen. The printer was running fine.
I carefully removed the key as I didn't really want it to be there and now my LCD screen is white and none of the buttons make a buzzer noise and both the RAMPS board and the mega 2560 are just sat flashing all the leds at me....
What does it mean and What should I do?

I got it running again, and now it isnt powering on at all. no lights, no nothing

Probably just buy new ones, they are very cheap if you buy from HK/China on eBay. If you can salvage the existing ones in the meantime then bonus you have a spare.

i've managed to get it running, im printing from SD so I need the screen, but the screen wasn't getting power from the 12v, but it does from USB.
Its a fix for now but will get new for spares.

its possible that you have fried the 5 volt regulator if it is working via the usb ok

maybe put the key back on it