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When i press o, it appears as '\o' (i.e. 'o' and backslash at the same time; the same applies when i press \). Similarly happens with g and t, + and 2 and maybe with some others.

Before that, I cleaned the keyboard with alcohol.

Should I disassemble it? If so, antistatic wrist is required?

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Sounds like a bad contact somewhere, most likely from some lingering liquid somewhere. Unless it's a laptop keyboard, the simplest solution is probably to just get a new one. Stop using it for a good week and leave it to dry if you want to be sure, or at least leave it in front of a fan for a good day. If it still doesn't work, remove the problem keys and repeat. If the problem is still present, you can try removing every single key, but... Chances are that it's busted at that point. –  Ariane Jul 29 '13 at 14:05

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