I can go to the drive-select page, select a known-good test drive, but a few seconds after going to the Apple and displaying the progress bar it restarts. Any idea what might cause a startup loop like this? Slight spill on right side of board toward the display connector, down by the headphone jack and some down by the battery connector. I can't see any sign of corrosion but the sensors are tripped red. No visibly-damaged components. Gave it an ultrasonic cleaning.