Madcatz

try hooking it up to an external monitor and then power it on and see if that works.

if not, reseat your memory, take one dimm out (if you have two) and power on with only one, swap the memory, change slots. Try a memory dimm from another computer or brand new one.

Another thing to try, take out the battery, unplug the ac adapter from the computer, hold the power button down for 30 seconds, put the battery in, then plug the ac adapter back in.