SOURCE: My battery recently died and
I am very sorry to read your problem, but I'm afraid the unit is 'non-repairable'. I've seen this on more than 2 dozen Hyundai Sonata's. Replacing the battery had nothing to do with it... it's when the original/other battery went dead, the internal (already weakend/aged) circuits went permanently to sleep and will probably never wake up again. The 'reset' the dealer tried was merely removing power to the unit. In a sense, when your battery went dead and you replaced it, you also did a 'reset'.. but it wouldn't come back completely. The CD changer has known problems. The noise you hear is the CD Changer trying to 'boot up' so to speak. It's programmed to complete an internal 'Set Up' and "identification' of any CD's which may already be there -- it just quit working. Its Electronics have malfunctioned - basically the CD changer circuit board.
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