IMac has decided to start typing letters on its own even when a keyboard isnt connected.

hello
i have an imac that is just over a year old that has at first started typing what looked like latin or greek letters it was running Lion so i upgraded it to Mountain Lion, fixed any permission errors on the drive and then zapped the PRAM. Now its phantom types single letters like "o" or "i" even when there is no keyboard attached.
this occured even when i had booted from a thumb drive so i could run the hardware test (which i had to set in sys prefs because holding opt wasnt working on startup to select startup drive).
any ideas or help would be appreciated
mark

Since this occurs when booted from a different system (on the thumb drive) it must be a hardware issue. You will need to get it looked at and repaired.
Contact Apple using www.apple.com/support/contact if you are in a country that supports it or call the appropriate phone number on this page. Alternatively carry the iMac in to an Apple retail store or service provider.
Best of luck.

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