I had a new GE wireless keyboard and mouse set reserved - and finally got to use it when i upgraded my old system to a new core 2 duo, DG965WH, 2GB RAM system... keyboard worked fine initially - but found that sometimes, some keys are intermittent - sometimes don't work at all. The predominant is the "h" key. Worst cases, the other keys: u, h, j, m, 6 & 7 (main keyboard, not the numpad) and the backspace key. Funny thing is how they seem to be clustered (except for the backspace). Am wondering if there's a bad batch of keyboards or something. Re-installing the drivers don't seem to work.
You can also gently flick off the relevant letters with a screw driver and clean the underside and the actual keyboard switches, but one at a time incase you forget where they go.
I would be more inclined to think that its a mechanical problem. You didnt indicate how long youve been using it or how heavy a hand you have while typing but I think its probably a safe bet that the keyboard hasn?t worn out from use. I have had problems with lightly constructed plastic keyboards that are slightly bowed or warped in spots. The keys dont always make a connection with the contact below so your keystroke isn?t registered. Warped areas can easily extend over several keys, thus your clustering. If this is the case there really isn?t much you can do to repair it other than call the manufacturer if its still in warranty. If not you can experiment, perhaps there is some extra plastic in a critical area that wasn?t removed. Be warned though, not many keyboards these days are designed to be taken apart and reassembled easily.
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