Hi I got mac book air off ebay, and keyboard and trackpad doesn't work. Could anyone advise how to fix this? Things I have tried that don't work:- plugging external keyboard and mouse in Held down T Held down cmd or alt to get into boot up screen - doesn't pick anything up Tried holding tab on startup cant boot up from working external hard drive (which has operating system on) reset pram - doesn't seem to work I don't get any beeps, it does load operating system but everything seems to have frozen as cant use keyboard and mouse. Please can someone help as I cant think of anything else, when I bought it they didn't mention anything of liquid spills and cant see any evidence of this. There was problem with boot camp but when I got it working for few mins I managed to delete windows 7 partition. When I booted into windows 7 previously both mouse would hang but sometimes keys would type loads of letters without me typing them in. Thanks in advance for your help.