Mio 618 won't turn on

[Rooster10]

Hi I've a mio 618 it was working fine I had it hard wired in then all of a sudden it stopped coming on, I tried taking the sd card out and sometimes it comes on others it doesn't
I left it for about a week tried it on a different power source and it worked properly for a day then went back to just having the green light on
Any ideas? Thanks

 

[WhoWhatWhyUserName]

could have a faulty battery,
try charging/connecting to your PC and see if it powers up