You should remove them whole and sell to a buyer here, unless you'll be accumulating truckloads, then you'll be ready for the refiner approach.
If they're not whole, it won't matter much really, as they buy it by the pound anyway, as your yard buys other scrap. Most yards won't pay anywhere near what buyers here will pay for the motherboards, CPUs and RAM. You can find a number of buyers here from the main SMF page, in the "Buyers and Sellers" forum
The computer cases can then be tossed in with
scrap metal, the power supplies can possibly(depending on your local yard) go as electric motors/copper bearing. The CD/DVD and hard drives can be broken down further, depending on the time you have to invest in it, you'll certainly wish to at least remove the boards from these for sale to a higher grade buyer(as described above)
Good luck
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