If your laptop won't boot, there are a few different things that could be wrong. Some of these problems are easy to fix, while others will require the help of a professional computer technician.
1: A Battery Problem
One of the most common reasons for a laptop won't boot is because the battery isn't getting enough power. The best way to find out if this is the case is by plugging your laptop into an alternate source of power. You can use a regular wall socket or even the power cord that came with your laptop to verify whether the problem is caused by the battery.
2: A Charger Issue
Another reason your laptop won't boot is if you're using a faulty charger cable. Counterfeit or knockoff power cables can have too little amperage or voltage, so they can't charge your laptop or power it on. You can try buying a new charger, but it’s worth testing it on another device to ensure that it's working properly before going further.
3: A Faulty Fan
A laptop can't boot if its internal fans aren't functioning correctly. If you notice that your laptop is hot to the touch when you run it, or if you see smoke coming from the ventilation system, this means that your computer's fan is failing and needs to be replaced.
4: A Bad Screen
If you're seeing a blank display, it’s possible that your laptop's LCD screen is damaged or faulty. A bad display can make your laptop look incredibly drab, so you should try to replace it as soon as you can.
5: A CMOS Battery Failure
If your laptop won't start and you see one or more of its diagnostic LED lights blinking, it's a symptom of a CMOS battery issue. If this is the case, you should contact the manufacturer of your laptop to request a replacement.
6: Component Conflict or Failure
If you notice that your laptop won't start but the components in it are all working, it's likely a component conflict that has affected the motherboard and the other parts. It's important to contact the manufacturer for more information about the issue, and you can also take it to a computer technician to get it fixed.
7: An Encrypted Hard Drive
If the data on your laptop is encrypted, you may not be able to access it until you enter Safe Mode and remove the password that's been protecting it. This can be done by pressing a key or inserting an installation disc to force Windows into advanced boot options.
You can also create a recovery disk to use in cases where the original operating system isn't working. You can use the recovery disk to reinstall Windows and restore your settings. You can also use it to install a fresh version of the operating system and remove any corrupted files from your computer.