Um my two Bob's worth ....
Alumina (Al2O3) is a mineral refined from Bauxite and is smelted into Aluminium.
When you smelt (make) Aluminium you "disolve" the alumina in a very very very nasty solvent called Cryolite (which disolves pretty much everything) at a temperature of about 1000 degrees Celcius (== really quite hot). You then pass a current of about 200,000 Amps (that is the correct number of zero's) through the disolved alumina (using carbon anodes and cathodes) to "rip" the Oxygen atoms off the alumina and produce molten aluminium.
Alumina and carbon do not react unless the alumina is disolved (at 1000 degrees celcius) and the reduction reaction requires a rather large amount of energy (about 1000kWx24hours to make one tonne of aluminium if you are interested), somehow I don't think that a computer would survive too long in this environment, and if you thought that the Dell power brick was big .... !
A 500 tonne per day aluminium smelter uses the same amount of electricity as a city of 1 million people including all the homes, businesses, shops, factories etc. (500MW)
PS Don't flame me, I worked in an Aluminium Smelter for 6 years and my wife is the manager of an aluminium smelting research group.