I have a 2008 Two 2.8 GHz (E5462) Quad-Core Intel Xeon "Harpertown" Mac Pro. It wouldn't boot up completely the other day so I took it to the Apple store and I was told that a processor was most likely dead and that it was going to cost 800 dollars per processor to replace it. They told me I could just replace one but they couldn't guarantee that just one processor was dead and also they mentioned if they put in a new processor with the bad processor, it might mess up the new one or something? Anyways, I'd like to keep my mac pro and I'd like to not spend 1600 dollars just to replace the processors. - I remember when buying this model that there was an option to purchase a Mac Pro with just a single quad core 2.8 processor. If I remove the bad processor from my mac pro would it then work again (assuming just one processor was bad), or can I not just use a single processor with my mac pro? -If the above will not work, are there any cheaper processor(s) I could buy that would work with this model (2008). Thanks for any help!