Cant do it...aftermarket motherboards rarely fit in OEM Dell cases, and even the ones I manage to rig into Dell cases arent compatible to the front panel connector setup that comes with Dell cases. ALso..Dell OEM PSUs do not work on regular motherboards and vise versa.
Dell (anymore at least) = suck
So Id have to buy (a) the new chip (b) the new motherboard (c) a new case (d) a new PSU and (e) new memory since a Sempron compatible board will not take RDRAM memory modules.
So we;re talking basically buildign a whole new computer, which my friend is not currently financially comfortable with