Have you checked over all your connections(i.e.power, ground, signal)?? That is the most likely culprit. Outside of that I would say something internal is wrong with the head unit. You could try taking it somewhere and have it serviced. Other than that I would say it's time for a new head unit. Hope this helps.

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Brad W.
1998 Silver Frost SE
KKM Induction--Narva Bulbs
1999 SVT Wheels--BFG g-Force KDW's
Custom Acoustics-- http://photos.yahoo.com/brantleyiii
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"Good leaders are scarce, so I'm following myself."