Got new phenom 555 today and had ago unlocking with a biostar 780g which it failed to do so with acc, but looking via Google it told me my CPU was the right batch, anyways stuck it in my gigabytes m720-us3 and it unlocked to a b 55 but on opening Windows 7 it locks up as my programs are about to open. Well obviously this is a bad core but when I've reset my cmos back to a 555 it still locks up in same place HELP