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Keyboard maybe broken

Hello,
I upgrade the ram on my netbook acer aspire one d257-1814 from 1gb to 2gb, and since then, I have some keys of my keyboard not working (appro 15% of the keys won't work or give the wrong input).
I plan on buying a new keyboard but the problem is that I don't know how I damaged the one I have and I don't want to repeat the error.

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