I tried closing all the L1 bridges using a 2h 0.3 mm lead. I was very careful not to overlap between bridges, so that's not the problem.

Anyways, I tried starting up my computer, and I just hear this infernal beeping, and nothing else happens.

When I erase the pencil markings everything works again.

What could I be doing wrong in unlocking my 900 Mhz T-Bird?

Thanks for the help.