There is no corrosion and the computer still exhibits the same behaviors when it is unattached.

/edit/ this is my cheap bulleted list:

-The computer powers on the instant it's plugged in.

-The Power light doesn't do anything

-The PRAM will not reset.

-The power manager won't reset.

-problems still occur if the PRAM battery is removed.

-the reset switch turns the computer off.

-ctr-cmd-Power resets the computer

-the behavior doesn't improve when plugged in to an external monitor

-no disk activity continues past the chime (the chime is very short)