My National Microwave oven does not work at all. When I ut the switch on it is completely silent. Nothing happens.

Model No NN-MX20WF
S. No. SC83230338

Input 1250W 5-4A 249V 50Htz
Output 800W 2450MHtz

Manufactured Aug 2003
Purchased more than 5 years back

Manufactured by -Mitsushita Electrical Industrial Co. Ltd

C. P. Kulupana, February 2011