Explanation
If a laptop has been returned for a screen repair and the owner insists the screen is broken, but occasionally a faded image is able to be seen in very bright settings on the desktop, the first step the repair technician should take is to ensure the backlight is functioning as expected. If the backlight is faulty, the screen may appear to be broken, but it may only be dim or too dark to be visible

Dropping a smartphone can damage the digitizer, which is the component responsible for sensing touch input.
This can cause issues with tapping and swiping on the screen, as well as other touchscreen-related issues.
References: CompTIA A+ Certification Exam Core 1 Exam Objectives - 3.3 Given a scenario, troubleshoot mobile device issues

A printer drum is a component of a laser printer that transfers the toner to the paper. It is a cylindrical metal or plastic piece that is coated with a photosensitive material. The drum is charged by a laser beam, which creates an electrostatic image of the document to be printed. The toner then sticks to the charged areas of the drum, and the drum rolls over the paper, transferring the toner to the paper and creating the printout1.
If the printer drum is damaged, worn out, or dirty, it may not be able to transfer the toner properly, resulting in blank pages. According to some web search results23, some signs that a printer drum needs to be replaced are:
*Faint, light, faded, or blank printed pages
*Streaks, spots, or lines on the printed pages
*Error messages indicating a drum problem
To fix this issue, the technician may need to clean or replace the printer drum. Some web search results12 provide instructions on how to perform a manual drum cleaning or replacement.
Printer ink is not a likely cause of the issue, since the user has already tried installing different toners and the issue persists. Toner is the powder used by laser printers, while ink is the liquid used by inkjet printers. They are not interchangeable4.
Environmental temperature is not a likely cause of the issue, since most printers can operate in a wide range of temperatures. However, extreme temperatures may affect the quality and performance of some printers. For example, high temperatures may cause ink to dry out or toner to clump, while low temperatures may cause ink to freeze or toner to become brittle.
Corrupted printer drivers are not a likely cause of the issue, since they would affect the communication between the printer and the computer, not the printing process itself. Corrupted printer drivers may cause errors, delays, or incorrect outputs, but not blank pages.

The technician should boot into the BIOS and enable the TPM on the new motherboard to enable the system to boot again and get access to the stored data1.
Boot into the BIOS and enable the TPM on the new motherboard. Explanation: After upgrading the motherboard, the TPM may need to be enabled in the BIOS in order to access the encrypted key and boot the system. Enabling the TPM on the new motherboard should allow the system to boot and provide access to the encrypted data. References: CompTIA A+ Certification Exam Guide, 220-1001, Chapter 13