Problem with my tomtom go

Question

Problem with my tomtom go 910, was working perfectly untili went on vacation for five weeks. Went to use it and couldnot switch it on so i thought the battery must be low, so i was going out in the car and plugged it in to charge.After a while i managed to switch it on but could only get the tom tom logo and then could not switch it off, the battery ran down now nothing. CAN SOMEONE "HELP"