Thank you for the reply Martaine. I had it apart last night and couldn't see anything obvious. I checked your suggestions today and all good. I plugged it into the wall to try one more time before taking it apart again and it lit up but only intermittently. It's usually kept in the barn but was...
Although it's brand new, i bought it on e-bay, so no warranty.
The charger is completely dead; no lights.
It was only my 2nd time using it!
Where can i start to diagnose the problem?
Thanks.