No display usually means something else is bad. Could be expensive to fix as it's often a dead mainboard. Try the generic reset noted in the link to follow.
I have an ACER Travelmate 5520G that won't boot. When I press the power button power indicator turns green and the hard drive activity indicator blinks for a few seconds, but then nothing else happens. I can hear the fan running, but that is it.
What do you think is wrong?