220-1101 Hardware and Network Troubleshooting Practice Question

Answer analysis

Option-by-option breakdown

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

• ✗

  Power supply

  Why it's wrong here

  A faulty power supply typically prevents the system from completing POST entirely, or it causes sudden shutdowns and resets under load, rather than generating a two-short-beep pattern. If the BIOS is alive enough to emit a structured beep code, the PSU is already delivering the required steady voltages to the motherboard and CPU. The two short beeps are a prompt-and-response diagnostic signal tied to a specific system component, and PSU faults do not map to such a code. Insufficient or unstable power is more likely to produce random resets or a dead system with no beeps at all.

• ✓

  Memory (RAM)

  Why this is correct

  Two short beeps are a widely used POST code for a memory read/refresh or parity error in RAM, frequently seen on AMI BIOS implementations. Because the CPU has already executed BIOS startup code, the fault is isolated to the RAM subsystem—so the technician should power down, remove and reseat the DIMMs, clean the gold contacts, and test each module individually in a known-good slot. If the beep pattern persists with all but one stick removed, the module or the motherboard's memory channel is the likely culprit. This code specifically differs from a video or CPU failure pattern, which is why RAM is the first component to investigate.

• ✗

  Graphics card

  Why it's wrong here

  A video adapter failure normally produces a different, more extended beep sequence—for example, one long beep followed by two or three short beeps on Award/AMI systems, or eight short beeps specifically for display memory errors in AMI BIOS. A two-short-beep pattern is not a standard indicator that the GPU has failed, since the BIOS distinguishes between system memory errors and video memory errors. If the graphics card were completely uninitialized, the POST code would likely involve a video-related beep pattern or no beep at all if the system also lacks a speaker. Thus, two short beeps should direct attention to system RAM, not the adapter.

• ✗

  CPU

  Why it's wrong here

  A CPU failure prevents the processor from executing the BIOS's POST routines, so the outcome is typically no beep at all (the system appears completely dead after power-on) or, on some firmware, a continuous short-beep loop indicating a processor power or system standby issue. A concise two-short-beep code requires the CPU and chipset to be running, because those beeps are generated by firmware executing on the CPU after initialization. If the CPU had failed, the motherboard would not be able to emit a structured, component-specific beep sequence. When two short beeps occur, the CPU has already passed its own power-on self-test and the failing subsystem is most likely the memory.

Go deeper

Related to this question