If there are no knowledge articles about the equipment, I would tell management about it. In the long run, you can try sitting for the Server+ exam, but management needs to know that their knowledge base needs updating. Your manager needs to provide you with a clear job description with the resources you need to be successful. If no one seems to know what they are doing, and your coworkers are hiding information from you, that's another reason for management to do intervene.

If the monitor went blank when you enabled Secure Boot and disabled CSM, then Secure Boot may have disabled your monitor or graphics drivers. Chances are, Secure Boot doesn't recognized the drivers as digitally signed. Your options may be to: (1) Disable Secure Boot again. (2) Reinstall the OS under the current configuration (with Secure Boot enabled).

It sounds like you had 2 legacy PATA drives in a master/slave configuration, and the technician upgraded them to newer SATA drives without consulting you first. The new SATA drives should perform better, but if your wife can't complete her writing, the technician should return and get the PC up and running again. The article below explains the difference between PATA and SATA: Difference Between PATA and SATA - GeeksforGeeks

To perform an automatic repair, you must use the power button to reboot your computer several times in quick succession. Timing is crucial here. Press the power button to turn on the computer. When the Windows spinning cursor appears, immediately hold down the power button for about 5 seconds or until Windows shuts off completely. The trick is to press the power button before the Windows login screen appears. When the computer turns off, repeat the process. After 3 or 4 reboots, your PC will perform an automatic repair.

Try running the audio troubleshooter. Open a command prompt window by typing CMD in the search box at the bottom of your display. Right-click Command Prompt from the list of options and select Run as an administrator. In the command prompt window, copy and paste the following and follow the prompts: %systemroot%\system32\msdt.exe -id AudioPlaybackDiagnostic Select your speaker from the list of audio playback options to troubleshoot it.

If the problem started after you tried to extract the zip files, those files may have corrupted your system. Please try reinstalling Windows, just in case any malware may have been in the files.

It looks like your computer is attempting a PXE boot, which means it's searching your home network for a server image to boot from. The error is because no such network server exists. Configure your computer to boot to Windows instead. Turn on your computer again, but this time, press ESC and then F9. If you see your Windows installation on the list of boot options, select it to boot to Windows. If you don't see your Windows installation on the list, you may have to reinstall Windows. Ifixit has a guide for installing Windows 10 below: How to install Windows 10 over USB - iFixit Repair Guide

When you receive his PC, please try the following: (1) Firmly re-seat the PCIe riser card in its slot and reset BIOS to its default settings. Confirm that BIOS recognizes the card without errors. If BIOS displays a problem, try another slot. Try a BIOS update, as well. (2) Launch Device Manager, uninstall the display/monitor drivers, and reboot the computer. Windows will detect the monitor and install the drivers it recommends. (3) Try the device troubleshooting utility. Open command prompt as an administrator, copy/paste the following, and hit Enter: %systemroot%\system32\msdt.exe -id DeviceDiagnostic Follow the prompts to allow Windows to look for the problem. If none of these work, then manually isolate the problem component. Try a different monitor/cable, computer, monitor DP port, PCIe card, PCIe slot, and drivers. Confirm that the problem returns before moving to the next component.

Try blowing out debris from the port with a can of compressed air. Amazon sells compressed air at the link below: https://www.amazon.com/Falcon-Compressed-Disposable-Cleaning-DPSJB

If your monitor loses its signal unexpectedly, the problem may be your PC-to-monitor connection. Please try the following: First, unplug your monitor cable from both ends: the PC and your monitor. Then, plug it back in. Try to plug the cable in different ports, if possible. Second, reinstall the monitor drivers. Open Device Manager by typing devmgmt.msc in the Search Box at the bottom of your screen. In Device Manager, scroll down to the "Monitors" entry and double-click to expand the list. On the list, right-click your monitor driver and select "Uninstall device" from the popup menu. Finally, restart your PC. Windows will automatically detect your monitor and install the drivers it recommends. If these do not work, try a cable you know is good.