Garmin Nuvi 680 - No boot after battery replacement

Hi all,

Like a doofus, I tried following text instructions and a YouTube video for battery replacement on my Garmin Nuvi 680 (this was before learning about ifixit).

Surprisingly, I was able to get everything apart without losing anything and back together with no leftover parts :D

My issue is that the GPS won't boot back up now (or, at least, nothing is showing on the screen). I thought that maybe the battery needed to be charged, so I left it to charge for an entire day. No dice.

To check and see if it was the unit or just a bad battery, I reinstalled the original battery and got the same result - nothing displaying on the screen.

When separating the two halves, I did manage to pop the ribbon cables off, accidently (the instructions I was following did not mention disconnecting them, like the article here does). I got them reinstalled, but am not sure I did it correctly and only the two that have latches came off.

Any ideas on what to check or what may be causing the issue?

Thanks,

Ed