The microwave heating in all microwave ovens is done by an component called a magnetron - its usually is quite durable and can last for years.
To see an image of what they generally look like, check out
http://www.upv.es/gcm/docente/images/mag_section.gif However it can fail and being a sealed item is not repairable.
A simple test is - try and microwave heat a half glass of water for 1 minute - no hot water means no microwave energy is being produced.
A replacement magentron may be available for your oven - but when you consider
1. the cost of the part (if still available) and
2. the labour cost to have it replaced and
3. the time you will be without a microwave - then it makes sense to just go buy a new one. It will be new - cheaper than what you originally paid, have a 12 mth or more warranty and probably have more features than your old one did.
Grill and Convection features:
If you have an microwave oven which also has an inbuilt grill and convection features then these elements can fail also. They are replacable, are generally far cheaper than magnetrons and it may be cost effective to have a failed element replaced (they are a similar sort of element to what you find in an ordinary stove oven)
NOTE: Non qualified persons should NEVER ATTEMPT REPAIRS to a microwave oven - failed magnetron or other fault. There are very dangerous voltages associated with its both its operation and in surrounding components - these voltages may still be there even with the machine unplugged plus the actual radiation of microwave energy may no longer be directed as normal to inside the oven - it may go for you!
Despite there being safety interlocking features built in to protect the user in normal operation, play around inside the oven case and there will be no protection, You may end up being the item being cooked in more ways than one.
If there is no replacement fuse apparent on the outside of the unit don't go looking for one inside.
If you must have it repaired TAKE IT TO A SERVICE CENTRE and get a quote for the total cost of repairs - never play with it youself.
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