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Please read the Piano Forum FAQ for more details. Also, read the piano FAQ for common questions on pianos Please don't ask us to place a value on your piano as an on site inspection is required. Contact you local piano tuner who will be more than happy to help.
Unless you have been doning something that has been changing the default settings of the keyboad, I can't really see how resetting it will do much good.
Have you contacted the retailer or M-Audio directly? They seem to have a good customer service going there and would be able to offer you more hardware advice.