Probably bad capacitor(s). These deteriorate with age, particularly if they sit unused.
They're definitely suspect in any equipment over ten years old.
It might be possible to revive them without destroying them as follows:
At noon (or some other time of your choosing), turn the light on for ONE minute, then turn it off.
Next day at the same time, turn it on for TWO minutes, then off.
Next day at the same time four minutes, next day eight, etc.
At the end of a week you're up to an hour. If it's going to revive it will have done so. If it doesn't work then, it's dead.
If at any time you experience a problem like the fuse blowing or any unusual odor, turn it off and discontinue the process.