I can't tell you specifically what might be wrong but you should at least rule out the power supply. If you can try another power supply and still get the same behavior then you'll need to have the pedal serviced for repair.
Our local service center for your region is in Belgium. Here's their contact info:
Fuzz It - Line6 service center
Hugo Van Der Goesstraat 17A
Belgium +32 938 30580 (phone)