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The laptop will not turn on or show any sign of power.
Make sure the AC adapter (your charger) is plugged in and the charging light is on. If the light is not on and the charger is plugged in, the charger may be damaged. Consider buying a new charger.
If you have plugged in the charger and the charge light turns on, the charger is probably not damaged. If your laptop only turns on when the charger is plugged in, regardless of the amount of time charged, then the battery may be damaged. Replace your battery using this guide.
The laptop is taking you to an error message instead of loading the Operating System
If your computer crashes during use or will turn on, but not boot up, it is an indication that the RAM is damaged or running at capacity. Upgrade your RAM. Follow this guide to replace your RAM.
Your hard drive may be damaged. Back up all your files onto an external hard drive, and manually restore your computer. If this does not solve the problem, you will need to replace the hard drive. Follow this guide to replace your hard drive.
The laptop is becoming too hot
The ventilation path for the fan may be obstructed by dust and/or debris. Visually check the vents for any blockage. If dust and/or debris is found, use compressed air to blow out any dust. If cleaning out the vents does not fix the problem, the heat sink may be broken or clogged. Use this guide to replace your heat sink.
While your computer is running place the bottom of the laptop against your ear. If you do not hear the whirring sound of a fan, the fan may be broken. You can use this guide to replace the fan.