It may be a idler pulley bearing starting to freeze up remove the belt and turn all pulleys,power steering pump, alternator, idler pulley , etc. to find out if there is excessive resistance offered if so this is the culprit, on the idler pulley check the raidial play in the bearing by trying to move it by holding it with your hand and try to wiggle it gently back and forth same with the other (pulleys) check for loosness or play in pulleys bearings if everything checks out ok the battery may be running low and upon startup the alternator is under alot of strain to compensate for the recent drain on the battery while it is stressed to turn the starter to start car, your car may be drawing power from the battery as the car sits causing this condition disconect the pos. terminal of the battery and run a positive voltmeter wire to battery terminal then run negative volt meter wire to the now removed positive battery terminal cable set the voltmeter to dc there should not be 12 volts present if so there is and open circuit present drawing down the battery as the car sits while off.
Good luck
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I know for sure that the noise is comming from the center pulley on the engine (do not know what it is called?). When I spray some oil down behind the pulley with the engine running the noise stops temporarly. Also, the noise goes away after 10 - 15 minutes with the engine warm, but squeals under acceleration.
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