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InvisibleM
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Sounds like your light fixture/ hood is not grounded. Shouldn’t have to run a separate wire for the ground. Assuming you have a three wire cable going to your lamp base, if not that’s a problem. There is probably a disconnect between your ground wire and the hood. Typical reasons for this problem are painted parts and or screws that do not conduct electricity. Sometimes anodized or some other coating that doesn’t conduct electricity is the problem. So if the lamp base is grounded and the base assembly is painted and its bolted to the hood sometimes just using a star washer or something to dig into the paint so it will make connection with the next piece of hardware will do the trick. Good troubleshooting skills finding that problem.
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You nailed it... even though the 4 square box above the hood fixture was connected to the ground in the lamp cord, somewhere it wasn't making a good connection with the rest of the hood (it's all metal).
The reason I know this is I did a continuity check between the hood and a known good ground which I didn't mention in my earlier post.....
But still, with magnetic ballasts it wouldn't have mattered.