Hello - first connect your laptop to its AC adapter to ensure a dead battery is not the issue. Also, disconnect any external devices connected to the laptop (i.e. mouse, USB device, etc.). If this doesn't help, disconnect the AC adapter and remove the battery (guide is provided by our page). Leave the battery disconnected for at least a minute, then reconnect and try powering on. If this doesn't work, most likely the hardware of the laptop has failed in some way, and you should either contact Gateway for recommendations, or just take it to a computer repair shop to have them diagnose the issue.