Question One RAM slot is not working - only beeping

shujah200

Estimable
Dec 30, 2018
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My Dell Inspiron 15R 5520's upper RAM slot is working fine. But when I put the same RAM stick in the lower RAM slot, it causes beeps, and the laptop doesn't boot up. The RAM stick is working absolutely fine.

I have cleaned the RAM slot and stick and there are no visible damage or bent/broken slot pins.

How to confirm that the slot is faulty or there is some fault at the motherboard?

And how to rectify this problem?