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Most likely to be the magnatron fuse has blown, due to the high voltage it
has to be large, and it's a very low value... few hundered milliamps, so a
very thin fuse wire,
They break from fatigue quite often, usually easily enough to tell, if the
glass of the fust is still clear and you can see the wire but with one end
no longer atatched, that's whats happened, where as if the glass is black,
then a fault blew the fuse,
ebay sell the magnatron fuses for a few quid, or you could call an engineer
out to replace it for about 50 quid.