220-1101 · Question #448
A technician is working to replace a single DDR3 RAM module on a laptop that has two occupied slots. When the technician tries to turn on the laptop, the computer starts beeping and does not pass POST
The correct answer is D. Unsupported memory. The 'low voltage' motherboard message is the key clue. DDR3 runs at 1.5V, while DDR3L ('low voltage') runs at 1.35V. If the replacement module is DDR3L in a board expecting standard DDR3, or vice versa, the mismatch triggers a voltage error and prevents POST. A faulty power adapt
Question
A technician is working to replace a single DDR3 RAM module on a laptop that has two occupied slots. When the technician tries to turn on the laptop, the computer starts beeping and does not pass POST. The technician double-checks the newly installed RAM and notices a motherboard message indicating low voltage. Which of the following is the most likely cause of this issue?
Options
- AFaulty power adapter
- BIncorrect BIOS settings
- CFailing CMOS battery
- DUnsupported memory
How the community answered
(29 responses)- A17% (5)
- B7% (2)
- C3% (1)
- D72% (21)
Explanation
The 'low voltage' motherboard message is the key clue. DDR3 runs at 1.5V, while DDR3L ('low voltage') runs at 1.35V. If the replacement module is DDR3L in a board expecting standard DDR3, or vice versa, the mismatch triggers a voltage error and prevents POST. A faulty power adapter (A) wouldn't produce a memory voltage message. Incorrect BIOS settings (B) wouldn't typically cause this on a fresh install. A failing CMOS battery (C) affects time/date, not RAM voltage.
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