220-1201 Practice Question: That their PC emits a single short beep and then…

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✗

  The RAM is not seated properly.

  Why it's wrong here

  A single short beep typically signifies that the Power-On Self-Test (POST) has completed successfully, indicating no critical hardware errors were detected up to that point. Issues with RAM, such as improper seating or faulty modules, are usually detected very early in the POST process and are often communicated via specific, distinct beep codes, such as multiple short beeps, a continuous beep, or a series of long beeps, rather than a single "all clear" beep.

• ✓

  The graphics card is not fully inserted into the PCIe slot.

  Why this is correct

  A single short beep is the most common "all clear" signal from the BIOS/UEFI, indicating that the system's Power-On Self-Test (POST) has successfully completed without detecting any critical hardware failures. If the system emits this beep but the screen remains blank, it strongly suggests that the issue lies with the video output path. A graphics card that is not fully seated in its PCIe slot is a frequent cause of this symptom, as the system powers on and passes initial checks, but cannot output video.

• ✗

  The power supply is delivering insufficient power.

  Why it's wrong here

  Insufficient power from the power supply unit (PSU) typically manifests as a complete failure to power on, intermittent shutdowns, system instability, or components failing to initialize, often resulting in no beeps at all or a system that repeatedly attempts to start. The presence of a single short beep indicates that the system successfully powered on and completed at least the initial stages of the Power-On Self-Test (POST), which contradicts a fundamental power delivery problem preventing basic system operation.

• ✗

  The motherboard CMOS battery is dead.

  Why it's wrong here

  A dead CMOS battery primarily affects the system's ability to retain BIOS/UEFI settings, such as the date, time, and boot order, when the system is powered off or unplugged. While it can lead to prompts to enter setup or boot errors due to incorrect settings, it does not typically prevent the system from completing the Power-On Self-Test (POST) and emitting a single "all clear" beep. It also does not directly cause a blank screen after a successful POST, as the core hardware initialization would still occur.

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