Switches off ...Panasonic NN-A574S Inverter Slimline Combi Microwave 1000w?

I've a 2 year old Panasonic Slimline Microwave, it's served us well, however after cooking some jacket potatoes on the jacket potatoe function, followed by a standard burst by the microwave, realised it had possibly over heated as tripped the electrical board. Ever since I have only been able to start it, and it virtually turns off after a second or two of operation. Anyone have any idea what may be causing this, or where I could have it repaired.

Many thanks
Mark