The best way to troubleshoot is to isolate the problem component based on what happens when you try to use the system. If the computer won’t turn on at all, then it’s probably not receiving electricity. Since the light by the charge port is lit, then your charging cord is working. That may leave the battery as the culprit.
Ideally, the best place to find the manual for a computer is from the manufacturer’s website. However, YouTube videos can offer some disassembly instructions if you can’t find the written manual online.
If multiple computers are unable to access Wi-Fi, I can think of three reasons: 1. A malware infection by a “worm” has spread to multiple computers and compromised their networking abilities, 2. The router or switch device that these computers are connected to frequently loses its ability to function properly and needs to be replaced, or 3. The network cards are fine, but the slots that they connect to aren’t. I think that it’s most likely that the network card slots are faulty, and only provide network access after you re-seated the cards in there firmly. Sometimes NIC card slots can widen slightly, hereby affecting their ability to make contact with the cards. Frequently removing/replacing the NIC cards can exacerbate the problem.
The reason why your PC won’t reset may be that there is corrupt data on the hard drive. Try opening a Command Prompt window as an administrator and running some commands that can fix the issue. To open the Command Prompt window, type “Command Prompt” in the Windows Search box on the TaskBar at the lower right-hand corner of your screen. Select “Run as Administrator” on the list that populates. Click OK on the User Access Control box that appears. Then copy and paste the following command into the Command Prompt Window: sfc /scannow && dism /online /cleanup-image /restorehealth && chkdsk c: /r Allow the command to run, and near the end you will see a message: Chkdsk cannot run because the volume is in use by another process. Would you like to reschedule this volume to be checked the next time the system restart? (Y/N) Type “y” and hit enter. Then reboot the computer. Allow it to finish the self-repair (it may take a while). Then try resetting your computer again.
It is hard to tell from here exactly what what done to the computer, but you can still fix it. A computer reset will undo all the changes that were made. To perform the reset, go to your computer’s Settings app by holding down the Windows Key and hitting “I”. When the Settings app window appears, Click on “Update & Security”. On the left column of the Update & Security page, select “Recovery”. That will open a pop-up window that offers two choices - “Keep my Files” and “Remove Everything”. Click on the “Keep my Files” option, and follow the subsequent prompts. Please know that you will have to reinstall your applications after the reset is complete because they will be removed along with your settings.
If the issue started when you switched from BIOS to UEFI, then the fix may be to restore the BIOS configuration back to its defaults. It is impossible for a computer to skip BIOS and go straight to Windows because BIOS is what activates Windows when you first turn the computer on. Try turning the system on and pressing F2 quickly and repeatedly before the Windows splash icon appears. This should get you into BIOS so you can undo the changes that were made right before the issue started.