MacBook Pro mid 2012 only boot without the battery plugged

hi!

sory if my writing is wrong.

Days before I was working in my MACBOOK with a MAC keyboard plugged, and then my admin session closed. the system didn't recognize my ADMIN PASSWORD.

I try to restart the computer and then the message in different languages appear. After various test, reinstalling OS X and changing Macintosh drives, the result is than the MBP only boot when the battery is Unplugged. When the battery is plugged no DRIVE is recognized, even an USB drive, in the recovery mode.

I buy a new battery and nothing change.

I tried everything.

The MBP ONLY work with the BATTERY UNPLUGGED.

If you know something to do, please, let me know.

Thanks

Matias