onkyo A 9555 help ASAP


I just both this unit in an unopened box on audiogone,
When I turned on it does but not sound or any feeling of heat making me think is working, the pure direct stays yellow and loudness as well, the input selector maintain all f them light up from CD to MD, the other half is not.
Basically it's all it does,I am frustrated with this purchase.
Any of you know this amp well enough?
I am sure some of yo guys do, I would really appreciate your help,
Regards,
128x128mountainsong

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