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Usually if you are having an issue like that you will get an error. I have a old Radio Shack HTX 404 that the battery that keeps the memory "alive" is shot, so if I turn it off for more than an hour it loses everything. But when I power it on....it throws an error at me before I do the reset.
I have an old Nak TM-1 with the same problem....I have isolated ot to the MPC cable connecting the two units; specifically, just outside of the back of the main box. Seems like an intermittent 'short,' even though there is no actual motion of this cable over the years. It mpc's-into the remote unit, but is hard-wired to the base unit. Anyone know if I can order/locate a replacement cable?
I was having the same problem and believe it or not, there happened to be a lot of corrosion and buil-up on the + side of the battery. I cleaned the post off with a good battery cleaner and put a good battery protectant on it. Since then, I don't have any problems with my radio not powering on at times. This is only one solution. You may have an intermittent connection somewhere in the electronics power jack for the radio. Mine was cased by a slight ocassional voltage drop.
Make sure it is completely powering down and you are not just dimming the brightness. Are you powering off by holding down the power button until shutdown, or are you choosing power off from the popup menu and pressing ENT. Go with pressing ENT on the power off option. If you are completly powering it down for sure, there is probably a malfunction and you'll need to get it taken care of.
Unplug the power cable, and then plug it back in...does the HDS-7 turn on by itself now? If yes, there is a probably short in the keypad, likely due to water intrusion. You'll need to contact Lowrance support at 800-324-1356 or you can email them by going to http://www.lowrance.com/en/Support/Product-Support/Contact/ to get it taken care of. Give them your serial number and name and address and phone number in the email to hopefully speed up the process.