My computer screen is black even though the power and chargelightareon

Hi @markian2047

If it's not responding to the Power button (did you hold it operated for >10 seconds?) you may have no choice other than to open it up.

Once it is opened, disconnect the battery cable from the motherboard (you don't have to remove the battery, just unplug the battery cable) and then press and hold the laptop's power button for a full 30 seconds and then release it.

Reconnect the battery cable, reassemble the laptop, connect the charger to the laptop and then check if it turns on OK.
Here's a teardown video that may help. The battery cable can be seen being disconnected at 4:09 minutes into the video.

If it now works OK, there may be a message stating that the date and time are incorrect. This is normal as the BIOS has been reset back to factory default by the above procedure. Once the date and time have been corrected, the message won't appear the next time the laptop is started. Also any user definable BIOS settings that were altered by you, to suit whatever operating requirements were needed, will have to be changed back as well.

If it still doesn't work, what's the motherboard model number (printed on motherboard) e.g. N14TBR120-TB90A or similar? Knowing this will help to find the schematics for the motherboard which will be needed to find out what's wrong.

Note: Be careful when working inside a laptop. Try not to touch anything that you don't have to to prevent ESD damage to any of the sensitive components. Wearing a wrist strap (example only) connected to an earth point is a good way to avoid causing ESD damage to electronics. Also be careful when using any tools as you don't want them to slip ;-)