CompTIA A+ Core 1 (220-1201)Hardware and Network TroubleshootingEasy
A client reports that their desktop computer occasionally fails to power on completely. When it does, the power LED on the front of the case flickers, and the system emits a series of short, repeated beeps. What is the MOST likely cause of this issue?
- AA failing CPU fan
- BInsufficient RAM installed
- CA faulty power supply unit (PSU)
- DAn outdated BIOS firmware
Show answer & explanationAnswer & explanation
Correct answer: C. A faulty power supply unit (PSU)
Flickering power LEDs and repeated short beeps often indicate a problem with the power delivery to the system components. A faulty power supply unit (PSU) is the most common cause of these symptoms.
Why the other options are wrong
- A. A failing CPU fan would typically lead to overheating warnings or system shutdowns, not power-on issues and flickering LEDs.
- B. Insufficient RAM might cause boot failures or specific beep codes, but not typically a flickering power LED during initial power-on attempts.
- D. An outdated BIOS firmware is unlikely to manifest as flickering power LEDs and repeated beeps during the power-on sequence; it's more associated with compatibility or boot issues.
Faulty Power Supply Unit (PSU)
A malfunctioning power supply that fails to deliver stable and sufficient electrical power to the computer components.
- Can cause intermittent power-on issues.
- Symptoms include flickering power LEDs, repeated short beeps, or no power at all.
- Often requires replacement to resolve.
Memory trick: Power problems often start with the supply, making the lights flicker and the system beep repeatedly.