This shows the LED status meaning:
http://wpilib.screenstepslive.com/s/...uick-reference
SO, what color are they blinking:
Power:
Green - Power is good
Amber - Brownout protection tripped, outputs disabled
Red - Power fault, check user rails for short circuit
Status:
On while the controller is booting, then should turn off
2 blinks - Software error, reimage roboRIO
3 blinks - Safe Mode, restart roboRIO, reimage if not resolved
4 blinks - Software crashed twice without rebooting, reboot roboRIO, reimage if not resolved, Constant flash or stays solid on - Unrecoverable error
You should be able to follow this procedure to recover the roborio to safe mode. Then re-flash the firmware:
http://wpilib.screenstepslive.com/s/...sing-safe-mode
While attempting to boot to safe mode be sure you don't have anything connected to the RS-232 (serial) port.