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If you have a multimeter with a diode test function,put the leads across the various transistor leads. When you get a diode reading, the positive supply connection will be the negative lead. In otherwords, the diode should be reverse biased. This is if the gate is not diode protected.
Ron

I didn't remember that particularity with diodes, thanks.

I had reversed the leads on the mosfets after not getting results and let out some magic smoke,but I wasn't able to notice what component roasted. I started touching them and I still couldn't find it, even by smell.

So I started testing the caps, reads ok, resistor, reads ok, inductor, hmm, this one read different than the others in the bag, not ok. I tested the diode but I noticed the reversal thingy, but the others in the bag all read the same way, so, reads ok. At this point I didn't know how to test the mosfet.

I asssumed the inductor was the weakest link in the chain, but I wasn't sure if I had fried it because the circuit had worked, or that I shorted the circuit. But now that I have the larger canister inductor, I'm pretty sure the reversal of the leads on the mosfet worked and the tiny inductor died from a current overdose.

Gonna test this soon (that's the problem with not having a dedicated workspace in a family environment, always gotta put everything away).