Man, too much work and brain trauma!
Sell the whole mess-whatever it is.
If you only need it for internet and general kitchen stuff, including TV possibly, browse around for a entry-level C2D. HP and Dell and IBM make some great warrantied laptops with T-5200/5300 series cpu's (not much L2 cache, but you don't need it). You can find one with non-integrated graphics, since you'll be in a kitchen and can plug it in, or one with IGP in a 14-15" screen size that will more than kill the bill for under $300, which if you sell whatever that is on Ebay and invest in the same amount for the difference for one of those laptops, will land you pulling probably less than $50 out of your pocket for this whole thing.
So what is better, all the work or paying $50 maybe all said and done to get something like a Dell 1420 almost new?
all the bios and undervolting/research/upgrade and messing with a system and taking weeks and still maybe not getting it right?