This question was answered on October 19, 2004. Much of the information contained herein may have changed since posting.
Try cleaning it a can of compressed air or a small vacuum cleaner to remove dust and dirt from the keyboard Use compressed air in small bursts and blow in a direction outward.
Most broken Keyboard are not worth fixin', you see keyboards are so cheap nowadays Just buy a new one.
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Posted by gilbert of Katharine Gibbs School - New York on October 19, 2004