Lowrance HDS help

[C-Bass2mouth]

I recently installed the LSS-1 sidescan module/transducer with my existing HDS7 gen2 & HDS5 gen2 units. Everything was running fine after installation, and my console HDS unit randomly powered off. And of course now won't power back on. No fuses were blown, the plug has enough power, and my bow unit works fine when I tried it at the console. It's not under warranty, and everything I'm reading says it's really pricey to send it back to Lowrance for repair. I read there is a soft reset I can do to the unit, but I wouldn't think you could even do that without it powering on. I haven't taken the face plate off yet to see if there was any water damage etc. Any ideas of what to do before sending it off?