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If it were me, I'd take off the serp belt, start the car and see if the sound goes away. If it does, Its a component run by the serp belt. Check each pulley for play, roughness etc.
Put the belt back on and use a stethoscope on each component to verify diagnosis.
I suspect the waterpump.
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Current car
2000 Boxster 2.7l red/black
Previous cars
1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
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