Check that the power adapter is plugged in securely
Try a different wall outlet
Inspect the charger and cable for damage
Remove the battery if it is removable
Hold the power button for 15 to 30 seconds
Reconnect the charger and try turning it on
Try a known working charger if available
Disconnect all external devices
Check for indicator lights or fan noise
Reseat the RAM if you are comfortable opening the laptop
Try a hard reset or power reset
Let the laptop charge for at least 30 minutes
Check for a loose or damaged charging port
Test with an external monitor
Contact the manufacturer or a repair technician if it still will not turn on