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Question

Difficulty: MediumMotherboard, RAM, CPU, and Power Issues

A technician is servicing a desktop computer after a user attempted a memory upgrade. Upon turning on the power, the system fans run continuously, but no video appears on the monitor and the motherboard emits a distinct POST beep pattern (one long beep followed by two short beeps). The user believes the operating system files were corrupted during the upgrade. Which of the following hardware issues is indicated by these symptoms?

  1. A memory module is improperly seated or defective.Answer
  2. B
    Operating system system files were corrupted during the upgrade.
  3. C
    An SO-DIMM module was physically forced into a standard desktop DIMM slot.
  4. D
    Installing memory into non-matching channels completely prevents POST execution.

Answer

A memory module is improperly seated or defective.
POST beep codes are emitted by the motherboard speaker during pre-boot initialization when hardware critical to basic startup fails testing. A failure pattern occurring immediately after a memory upgrade indicates that the newly installed RAM module is either defective or not seated completely in its socket.

Step-by-Step Solution

1
Analyze the diagnostic indicators present during power-on.
The system emits a POST beep code (one long, two short beeps) before video output or OS boot occurs.
Power-On Self-Test (POST) runs firmware-level hardware checks prior to loading the operating system.
2
Differentiate between firmware hardware indicators and software/OS errors.
Beep codes signify a critical hardware detection failure (commonly RAM or display adapter depending on BIOS vendor) rather than software corruption.
The OS is not accessed until POST completes successfully.
3
Determine the most probable root cause following a memory installation.
The newly added RAM module was likely not seated completely into the slot or is defective.
Physical installation errors are the most common trigger for new POST failures post-upgrade.

Key Concept

POST Beep Code Diagnostics and Hardware Initialization
Estimated Time:1m 0s
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Topics

Motherboard, RAM, CPU, and Power Issues

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