Dell Inspiron 8200 Power Problem

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My Dell Inspiron 8200 vintage 2002 has developed the following power

When running on AC the power adapter light turns off and the adapter
stops supplying power to the laptop/batteries.  If I unplug the adapter

and wait a few minutes then plug it back in the light on the adapter
comes on and power is supplied to the laptop/batteries for about 2-3
minutes then it powers off again.

If I plug in the adapter but do not attached the laptop the power light

on the adapter remains on forever.

I am thinking the most likely cuplrit is the DC supply board.  BTW-I
have also noticed an odd sound (techinical term) coming from the
fan/power supply area of the laptop when operating.  The noise is like
a scraping sound and does not correlate with the HD operation.  Also
the fans seem to work fine although I notice the odd sound when the
fans are not running.

Does anyone have experience with this situation?????  Please advise..

Bewildered in Phoenix

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