In my case the problem on an 80G video turned out to be that the white plastic frame that keeps the hold switch external slider aligned to the actual internal switch was broken, so that the external slider lost alignment and contact with the internal switch and wasn't doing anything. There is no replacement part of the plastic frame.
poke each pinkie finger in, each on the outside of a red box in the picture, and gently bring them together until the antenna pops off from the spring. didn’t take much force in my case and you can exert smaller force with your pinkies.
EMC2134 requires PC2-5300 as specified here. PH1 worked ok. Need to give RAM tabs a pretty firm pull to initially unseat, then it is easy to slide RAM back.
In trying to fix the hold switch, I discovered a problem that can't be fixed---at least, i don't see where a replacement part is available. The white plastic frame for the slide switch was broken at its weakest points, at either side of the cross piece that forms one long side of the opening for the slider. If that is broken, then the slider can easily slip out of effective contact with the actually switch and the switch cannot be manipulated. The best I could do was to set the iPod off hold and remove the external slider so that there is at least marginal access to the internal switch. This is not really an easy to use switch now, but at least the iPod is usable.
Just above the right hand (upward-facing) screw on the old jack you need to remove a grounding ribbon that is attached with a weak adhesive. Reattach it when installing the new jack so that there is contact with the case.
