My p4s533 will not post past the memory test. It says"system failed memory test". I have 256 mb samsung 2700 ddr non-buffered memory in it that worked fine for 5 months. I bought a new stick of crucial 256 2100 ddr non-buffered thinking that the samsung went bad. Same result. No matter which stick is in which slot same result. I have cleared cmos. I have pulled processor to see if that would fail 1st in post and it did. As soon as i put processor back it fails memory test. Any ideas.