My laptop is not turning on and not charging

Obviously, if it is not charged, it won't turn on. If it is plugged in and not turning on, then the first suspect is the adapter cable, then the adapter itself. After those are eliminated, the problem might be the connector on the computer, then an internal problem.

It is all a matter of elimination. Try another cable if it is detachable, or another adapter.

After that, the computer needs to be opened up to find any internal problem.

@sklsujal First you want to check your power supply. Make sure it has the proper voltages. Check to make sure that connectors are not bend etc. Check the DC-in jack of your laptop. Make sure there is no corrosion, debris etc. that prevents it from working. Clean it of any debris etc, use a few puffs of air to clean it out. Here is the Thinkpad L450 Hardware Maintenance Manual and it will tell you how to check your power supply etc. Start on page 23 with a general checkout.

If none of this works, get an ammeter and see if your laptop draws any amperage from the charger. After that, you need to check and see if your motherboard even gets power. For that of course, you need to open it up. Your best check on that one will be the DC-In jack. Check page 83 for location and to work on it.

If all of that checks out and you have power to the motherboard but nothing works, we will need to know the exact motherboard that is used on your computer. We can most likely continue to assist with this computer, even on a boardlevel. Post Some good pictures of what you see. That way we can see what you see.

Adding images to an existing question