So you've tried taking the battery out, disconnecting the charger and holding the power button for 10 seconds?
Leaving the battery out, plug the charger in and try powering on - If it doesnt come up at all then either the power supply is dead or the laptop is.
put the battery in WITHOUT charger and try turning it on, does the lights flash? if yes then try this:
plug the charger in WITH the battery in and try turning it on, does the lights flash?
IF YES, then you need a replacement charger. You can get universal laptop chargers from the internet for cheap. make sure you get the correctly voltage output charger. Check on the charger you have now to see how many Volts and Amps it gives out.