Modern motherboards require both the 24-pin ATX connector and a 4-pin or 8-pin CPU power connector. If the CPU power connector is not attached, the motherboard will receive power but the system will not boot.
CompTIA A+ specifically lists this as a common mistake after replacing a power supply.
Insufficient wattage may cause instability, but usually the system still attempts to start. RAM does not prevent power-on if missing; instead, the system produces beep codes. Redundant PSUs are used in servers, not standard desktops.
Therefore, the missing CPU power connector is the most likely cause, and this scenario reflects typical troubleshooting steps outlined in A+ hardware diagnostics.

A physical bulge under the trackpad is a classic CompTIA-identified symptom of a swollen lithium-ion battery. As batteries degrade, internal gas buildup expands the casing, pushing upward on the laptop chassis-often distorting the trackpad, keyboard, or bottom shell. This can cause cursor issues, clicking problems, and safety hazards.
Replacing the battery first is essential because swollen batteries can rupture, leak, or ignite. Only after the battery is removed and replaced should the technician evaluate whether the trackpad suffered permanent damage.
Replacing the trackpad (D) without addressing the battery fails to correct the root cause. The motherboard (A) and heat sink (B) are unrelated to the physical bulge.
Thus, the correct first step is replacing the battery.

A failing CPU fan may make unusual noises (including clicking) and, if it is not cooling the CPU, the system will quickly overheat and shut down to prevent damage.
From CompTIA A+ 220-1101 Official Study Guide, Objective 4.1 - Troubleshooting hardware problems:
"Overheating due to a failed or obstructed CPU fan can cause frequent shutdowns. Loud noises are a sign the fan should be checked first." Verified Source:
CompTIA A+ Core 1 (220-1101) Official Study Guide, Chapter 4: PC Hardware Troubleshooting CompTIA Exam Objectives 220-1101, Domain 4.1

The requirement to separate corporate and personal data on employee smartphones is a core function of Mobile Device Management (MDM). CompTIA A+ describes MDM as an enterprise toolset used to enforce security policies, manage applications, configure email profiles, and separate work-related data from personal user data. This separation is typically achieved through features such as containerization, where corporate data is stored in a protected, encrypted workspace that is isolated from the personal side of the device.
This ensures security, prevents data leakage, and enables IT administrators to remotely wipe corporate data without affecting the user's personal information. MDM solutions are widely used in BYOD (Bring Your Own Device) environments and corporate-issued devices.
Encryption (A) protects data but does not create separation. Network access control (B) restricts network access but does not manage mobile apps or data separation. Endpoint protection (D) refers to antivirus
/antimalware, not data partitioning.
Thus, Mobile Device Management (MDM) is the correct solution.

The most likely cause is a swollen battery, which occurs when the battery's internal components break down, causing a buildup of gas. This results in:
Physical Symptoms: The battery bulges, pushing the screen away.
Operational Symptoms: The device may still power on when connected to a charger but fails to hold a charge due to battery degradation.
Option A (Malfunctioning power supply): Incorrect. Power supply issues affect charging but do not cause physical bulging.
Option B (Damaged charge port): Incorrect. A damaged port can prevent charging but does not explain the bulge.
Option D (Broken screen): Incorrect. A damaged screen does not cause the device to bulge; it is likely a secondary effect of the swollen battery.
Safety Note: A swollen battery poses a risk of fire or explosion and should be replaced immediately following proper disposal procedures.
References:
CompTIA A+ Core 1 Objectives: 5.5 (Troubleshooting common issues with mobile devices)