How can i run hardware diagnostic in my Macbook pro running OSX Lion 10.7.2

Yesterday My 1 and half year old Macbook Pro 13.3" suddently developed a noisy fan and battery indicator also suddently changed from cable sign to X in the battery bar. when i removed the power cable, the computer suddently shut down. i plaged the power cable back and when i powered on my computer, the SLEEP LIGHT BLINKED 5 times and then startup sound comes after. Computer started on and still battery power indicater still indicates big letter X in the battery bar. What should i do?????????????????????????????????
Even when i click at the BATTERY indicator, no Green light appear as it was before.
NOTE: this computer is for home use only and i averagely use it for 3-4 hours everyday

Reset the SMC: http://support.apple.com/kb/ht3964
Should fix just this sort of thing.

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