During the installation of a PowerEdge MX7000, the implementation engineer notices the PSU health indicator stay on for one second, blink five times, then shut off. What is the issue?

Question

Options

• AThe PSU is faulty.
• BThere is a PSU mismatch.
• CThe PSU is performing firmware updates.
• DThere is no power to the PSU.

• A
  4% (1)
• B
  74% (17)
• C
  13% (3)
• D
  9% (2)

Explanation

Option B is correct because on the Dell PowerEdge MX7000, the PSU health indicator pattern of 1 second on → 5 blinks → off is the specific blink code for a PSU mismatch - meaning the installed power supplies differ in wattage, model, or type, which the chassis detects and flags before normal operation can proceed.

Why the distractors are wrong:

• A (Faulty PSU): A truly faulty PSU triggers a different LED pattern, typically a solid or blinking amber state, not this specific 1+5 sequence.
• C (Firmware update): Firmware update activity produces sustained, repetitive blinking - not a brief sequence that shuts off.
• D (No power): If there were no power reaching the PSU, the health indicator would show no light at all.

Memory tip: Think "5 blinks = mismatch" - five fingers on one hand don't match five fingers on the other if they're different sizes. When two PSUs of different specs are paired, the MX7000 "raises its hand" five times to flag the mismatch.

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