Can't Switch Off APC Backup

[Andy Talbot]

I have what must be the WIERDEST computer problem, EVER. Ever.

I have an APC Backup UPS 350 which all of a sudden won't allow me to turn it
off--short of unplugging and disconnecting the battery. If I depress the
power switch, the green "on line" flashes and it stays on.

There is NO WAY to switch it off. I even reset the circuit breaker switch.
No change.

I'm stumped.

Tips?

LRH