From your description, I would guess that the output stage of the amp is not working properly. Rather than the outputs being shorted (the most common failure), the output transistors appear to be open. This basically means that you are attempting to drive the speakers with a "pre-amp" section. This could be a power supply problem or defective transistors. An examination of the last stage of the amp is needed here. If the outputs are open, the parts cost will be in the $40-$60 range. Power supply repairs will likely be in the $20-$40 range for parts.
Hope this helps a bit.
Dan
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