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it could be nothing but why take a chance. i'm a worry wort about these things though. i don't mean to make you nervous, just get it checked so you have peice of mind. i hope it turns out to be fine, i have heard that some ballasts do humm louder than others. suprisingly, i only used 1 ballast my whole life(repaired several times at the hydroshop) and i could just have just got lucky and had a really silent one so that is why the buzz you talk of made me nervous. good luck.
ok i called the growshop i thought my growing partner baught the b allast from.....i walked about 5 miles today carrying on of those fucking ballast its heavy as fuck and it hot a hot day....anyway i get there and as im pulling it out the bag the guy says "thats not the ones we sell mate" im like ffs im at the wrong place...any turn out in short in need to get £50 fr a new silent ballast damnit
check this site out you can get ballast kits pretty cheap.
http://www.plantlightinghydroponics.com/