@bram1980,
You did not explain what steps you did.........:book: from the first post.
Please do so that way everyone has a clear picture of what steps you have taken.......
Use "Garmin Express" to update the firmware and anything else that needs updating or use the "Webupdater" from Garmin..
Spoiler: Garmin Express
OR
Spoiler: Garmin Webupdater
Leave the Garmin 50 on the PC and let it charge the unit up.
If it is a battery problem then look to getting a new battery.
Here is one of many places you can get a battery....
Spoiler: Battery for Garmin Nuvi 30, 40, 40LM, 50, 50LM
There are enough YouTube videos on how to replace the battery if you need to do that.
But make sure you do all the updates to the unit first......