Yeah same here, I'm actually quite surprised that they would use Fortron Power Supplies. Usually in any pre-built HP/ACER type brand pc you open up your case and see a psu with some fruity name and a single rail with 18A on it.
thats why brand builds are useless, i hate my old hp cant even take out the mobo its welded on. makes upgrading hard. i dont think there as bad now tho they let you change things, they still cost and arm and a leg tho