Laptop not Powering On

@ujuakuokafor 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. If none of this works, get a 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. Use something like this video to open your laptop up. Post Some good pictures of what your motherboard looks like with your question. That way we can see what you see. 在已经存在的问题里加入图片

Your computer most likely does have a Fujitsu 621881-X1 motherboard and I have not been able to find the schematics for this. You will need to depend on your own troubleshooting skills if the error is with the motherboard.