Remove battery, power, hold the power button for a minute, release and re-try?
It's among the usual at http://en.kioskea.net/forum/affich-255599-gateway-notebook-will-not-turn-on
Hi,
I have had this Gateway Nv53 for a few years and a while ago I dropped it. Sent it to the factory for repair and they supposedly fixed the only problem, a faulty power switch. Well since then it has lain unused but now when I try to boot it up the fan rapidly accelerates and within 15 seconds the computer shuts off. It is a Gateway NV53 model number MS2285 All help is appreciated.

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic