If you have HP laptop troubleshooting problems. Do not be alarmed; we will give you some answers. For the HP laptop's repair Look for the model and serial numbers on the laptop's bottom. By disconnecting the power cable, see whether the laptop can be started using only the battery. The power line of the PC has to be plugged in. Check to see whether the desktop is shown and the machine switches up. Restart the computer. Make sure the computer is connected to the internet.