Sudden Onset of Constant Fan and rubbish battery life....

2 days ago my fan came on constantly and, as a result - I get only about 2 hours of battery life with the BlackBook on with NO progs running (not even airport).
Tried everything - SMC Reset, Activity Monitor - the works. BlackBook only 14 months old so out of warranty but wondering what I can do. Tried running battery down then recharging it.
Would be grateful for your advice - the noise is deafening and the battery is more than annoying me as I used to get 4-5 hours!

What does Activity Monitor show? Anything? Do the same issues occur in a separate user account?
Are you certain you reset the SMC properly?
http://support.apple.com/kb/HT1411
~Lyssa

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