Garmin 178C GPS won't stay powered on

[Blue_Runner]

Bought this unit new about 8 years ago, never had a problem with it. Tried it out the other day on the lake and it would power on but only for a few seconds to a minute then power off. I have a brand new cable that I will install to see if that fixes it. I was wondering if anybody else has had this problem? There is a small amount of corrosion on the connector pins but doesn't look any worse than it has ever been.

Hoping to install the new cable this evening and will report back.