I have a Garmin 255 myself. And what I have found is, MOST of the time, the problem is that the CHARGER CABLE has an intermittent connection in it! So, when the cable moves, flexes, or stretches, the battery charge STOPS, and the (mostly discharged) battery cannot support the load, so the unit blacks out and turns off. Try S-L-O-W-L-Y moving the cable while connected with the unit on, and watch for evidence of a bad cable! Sometimes a DIRTY (trapezoid- shaped) connector will do the same thing!
SOURCE: the sound on my nuvi
The fact that it appears on speaker, FM & headphone jack, tells me its a problem in the audio output stage.
- Jim
SOURCE: garmin nuvi does turn on when connected to power in car
Hi
I had the same problem. My Nuvi 350 did not power up for a couple of days. I suspected moisture to be the culprit. So I took my wife's hair dryer and blew hot air(in the intermediate setting) into the SD card slot in the GPS for a couple of minutes. Take care not to overheat the GPS or Screen.
Pronto my GPS powered up without any issues.
Hope this helps
SOURCE: Garmin Nuvi 255 won't charge with the car charger.
You may need to replace the battery.
The video on the link below shows how to replace the battery in a Garmin Nuvi:
How To Change The Battery On A Garmin Nuvi 760
SOURCE: Garmin Nuvi Doesn't turn on
Try resetting the unit. The procedure can be found here:
http://www.sharc.net/discus/messages/6/313.html?1268661443
- Jim
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