Yea I wouldnt mess with it cuz dell makes their crap so only they can fix and upgrade it. Its kinda dumb, dells suck. I would replace the motherboard and CPU with something better and then you dont have to worry about all of Dell's garbage.
After my eMachines mobo fried, I ditched eMachines and bought a GigaByte mobo and an Athlon 64 3200+ and 512MB Corsair PC3200 RAM. Everything works great now and I can do all my own repairs.