Fishmark 320 won't power down

I've got a 4 year old Eagle Fishmark 320 that will not power down unless you unplug the power to it. I replaced it with a Fishmark 480, but would like to get the 320 fixed to go on my console. Other than this problem, it's in mint condition. Eagle wants $100.00 minimum to repair. Anybody have a clue how I might can get around the $100?

Thanks for any help:)

you could run the power through a toggle switch and turn it off that way, wouldnt cost but a couple of bucks

What Keith says.

A switch will work. I run all my electronics thru a master cutoff switch so I don't forget to turn something off.

Yeah, I'd already pondered that idea.......Just thought one of the electronics experts might have a miracle "reset" fix for the problem.......Thanks anyway.