my 2005 volvo s40 diesel shows the following reading on the dash:power supply service urgent.any idea?

2005 VOLVO S40
130,000 MILES
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INTRIGUEBA
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just yesterday,my volvo started showing the sign,power supply service urgent.it drove well but the sound of the engine changed a little bit.today a mechanic started the car and connected his diagnostic machine.after a while,it could not even start any more.
Nov 7, 2011 at 8:00 PM
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