that is what mine did last week! i went to turn them on in the morning and they flashed and made a buzzy noise.. but they didnt come on.. so i fliped them off, then back on, then the right one flashed and went out but the left one came on.. then wen i got home from school i turned em off them on then the 2nd one didnt even work.. turns out my ballast messed up an ruined all 8 of my new bulbs!! grrrr, so yea, i think it might be that. if it is take ur light out and dont turn em on cuz it will blow ur lights out. and get a new ballast =[. and they are expensive, unless its under warenty or w/e u spell it.. luckaly mine was.

good luck.jesse