Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148a Safari/6533.18.5) I got a used MacBook air on eBay and I noticed the some keys on the keyboard don't work as intended. For example, the '1' key does not work at all, the 'p' key would increase the volume, the 'delete' key would enable capslock. I've tried to do a clean install of Mac OS X but it would still do the same thing. Is my logic board broken? What else can I try to make sure that the keyboard is the problem and not the software?