...have you tried spinning the fan blade with the fan off to see if it spins freely? If it was THAT clogged with crap, you might have accidently got some more junk underneath the blade and into the spindle jamming it up. I've had it where a fan didn't work, but when I 'started it' by spinning it with me finger it would fire right up and would work from then on. (That's the bit I don't really suggest trying, spinning it while there's power. It can work, but unless you're quick you can get a painful "WHAP!". I ain't that quick.

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