Early 2009 MacBook Air. On startup no keyboard or mouse me to login. Neither is the USB working so I cannot use an external mouse or keyboard either.

Early 2009 MacBook Air. On startup no keyboard or mouse me to login. Neither is the USB working so I cannot use an external mouse or keyboard either. If I keep restarting the machine suddenly sometime I get mouse and keyboard control and I am able to login and work. After sometime though mouse and keyboard Control is lost again and the machine hangs.
Lately another problem has cropped up. Now the machine starts up and seems to work for longer time but I have no 0 key and USB everything else is fine.
What could be the issue

1. Reset PRAM. http://support.apple.com/kb/PH4405
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".

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The following article provides information relevant to the symptoms you described:
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http://support.apple.com/kb/HT1573
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Sorry I am so lengthy. The problem is that with the technical support guy on line, when the Mouse button 4 event occurred I described to the tech that I was pushing and pulling the mouse from the back end to avoid touching the buttons on the side and every time I rolled the mouse a few inches forward the dashboard assigned to mouse button 4 appeared and next when I rolled it back the dashboard disappeared, I rolled it forward and it reappeared and so on. Then the tech wanted me to click on the apple and go into system preferences and as my cursor touched the file menu to get to the preferences that menu dropped without me left clicking the mouse. As I passed over edit and view they just dropped down.
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Stephen

Early 2009 MacBook Air. On startup no keyboard or mouse me to login. Neither is the USB working so I cannot use an external mouse or keyboard either.

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