2003 Lexus IS 300

Noises problem
2003 Lexus IS 300 6 cyl Two Wheel Drive Automatic 109000 miles

when I attempt to crank the car its like a clicking noise over and over again rapidly! Before the clicking noise started I tried to jump the car off using jumper cables since the car's engine would not turn off! Wonder what's the problem? The battery? Alternator? Fuel pump? Starter?
February 2, 2009.

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