My son has an hp pavilion media center m8200npc. A month or so ago he started getting the blue screen of death. He was told by someone (who is supposed to know what he was talking about) that it was because the bigger graphics card and better power supply he installed would not work with the mother board that came with his computer and that he should remove them and put the original parts back in. He did so now he cannot start up and gets a code purple. Can anyone advise us to what to do? The pc is out of warranty. Thanks.