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