My computer wont start up - it just beeps

i was just wondering if anything can be done when you turn your comp on and the pc just beeps, ive read the Beep codes and from the sounds of things my 3 long beeps indicates a keyboard problem, ive done the checks on all things pertaining to the keyboard, even changing it, it then says after all this is done and still nothing happens that it might be the motherboard - is there anything else i can do before buyin another motherboard as my computer is only a year old
 
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