i have a mac book pro mid 2010 it just suddenly stopped working. when i turn it on there is no start up chime, i don't even hear the dvd drive spinning, the sleep light comes on and the fan is running and after ~8 seconds it reboots and like that it goes on. i tried removing the memory from one slot to the other but does not seam to work either. then i removed both memory stick and boot it but there was no beep. shouldn't there be a beep if there is no memory installed. is it possible that the firmware chip is bad?