Continues Beeping when turned on.

Hi a friend of mine brought me her MacBook Air to take a look at . She told me it continuously rebooted.

Plugged in MacBook, hit the power button, and I got nothing.

Next I held down the power button for 10 seconds, released, and pushed the power button again and the screen came on ( white, no apple logo)

After that I got on google and followed the instructions for resetting it, diagnostics, etc.

Now it beeps continuously. I stopped counting after 14 beeps.

I took the bottom case off..no water damage..it was a little dusty, but nothing major.

Any suggestions?