My macbook wont turn on?

i got some top case work done at the apple store, it booted and worked GREAT IN THE CAR i turned it of and tried to boot it in my room and it wont turn on! i hear the noise right before the chimes( the doDO do) like the hardware noise, anyway the screens black and the front light doesnt turn on, the power adapter is good and i took out the battery and troubleshot it but it still wont turn pn! ugh! plz help