I have this EliteBook 840 G1 laptop that won't start - it blinks on the caps- and numlock buttons 3 times which indicate issue with the memory modules. On one of the memory slots of the motherboard, I can see some corrosion (?) and my guess is that it's creating a short. At first I figured I could just omit using this slot but it wont start either way - also tried other RAM sticks of course.

I've tried to see if I could clean it up, but the laptop remains unbootable. Can it be because it has caused issue elsewhere or because it's still shorting in the memory module?

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Hello. My name is Thomas. Just looking for a place where I can post technical questions about eletronic repair and this seems like the place !