Is my mega broke?

A genuine board is waay too expensive, mainly because i'm a high school sophomore and i fractured my leg wrestling, so a job is out of the question

I'm using a Ni-Cd 7.2v battery that runs through a adjustable regulator. I can't connect it while it's connecting to my computer because it will overload it and shut down my mac, so while it's on my computer it's running on usb power