It is possible to repair, as david said, and I have done it-- it just requires a couple soldering points.
Find another old motherboard, and follow the cable down to the motherboard. The first two soldering points you come to need to be unsoldered, but first use a razor and cut the cable so you don't have to unsolder all 4 points that connect to the rest of the cable.
If you decide to try it, let me know and I can give you more detailed directions.
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ADDED INFO TO CHANGE HOLD SWITCH:
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Any kind of soldering should work, i think i use a tin-based solder. A soldering gun with a fine point is nice to use.
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In order to replace this hold switch, you will have to take the old one off first. In order to do this, you need to actually cut the ribbon with a razor. If you follow the hold switch ribbon down to the motherboard, you will see there are four soldering points in a square. Two of them go to the headphone jack (those on the right) the ones on the left are not actually wired to these. So make a vertical incision on this cable splitting the two right soldering points from the two left (this is if you are looking at the motherboard with the docking port down and the battery up).
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Once you have made this cut, heat up the two points on the right to remove the old hold switch.
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Not get your new switch (I'd suggest getting one from an old motherboard that is broken-- you will need to do the same cut and unsoldering to get it off). When you have the new switch, just thread it in and solder it where the old one was, in the same position.
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It is tricky, but good luck and let me know if you have any other questions!
It is possible to repair, as david said, and I have done it-- it just requires a couple soldering points.
Find another old motherboard, and follow the cable down to the motherboard. The first two soldering points you come to need to be unsoldered, but first use a razor and cut the cable so you don't have to unsolder all 4 points that connect to the rest of the cable.
If you decide to try it, let me know and I can give you more detailed directions.