Sometimes the laptop will not start working after being turned on. This problem mainly occurs because due to power supply problem. It can also be a result of overheating.
To solve the problem:
1. If you are using a battery, inspect it to verify whether it needs recharging. If it does, recharge the battery after fully discharging it first.
2. Check the connection of the power cable to the socket. The connection must be tight.
3. Laptop consists of external power indicator which can be checked in case power related problems.
4. Check the AC adapter. If the light on the AC adapter is not on, it is not working properly and must be replaced.
5. If the power indicator shows a blinking orange light, the laptop has probably shut down because of overheating.
6. Check the output vent of the laptop to see if the fan is working.
7. See if there is any dust covering the output vent.
8. Clean the dust carefully with a soft dry cloth.
9. Allow the laptop to cool down and then restart it.