Rick wrote: > In article <f4e013870903082220s772af2d7o22c9686d6f1347e9 at mail.gmail.com>, > MHR <centos at centos.org> wrote: > > >> 2) Your answer above was not clear: did the 4GB work by itself without >> the other 2GB? If so, the above is your problem. If not, you're in >> deeper guano that you think, BUT: >> > > The 4GB had the same problem with and without the 2GB. > ok, then you have the wrong 4GB (2x2GB?) sticks. You might review the memory specs for your motherboard, not all DDR2 is the same. http://www.intel.com/support/motherboards/desktop/d975xbx/sb/CS-026567.htm specifically, you need 1.8-1.9V DDR2 unbuffered DIMMs, requires SPD, 667 and 533Mhz. 2GB dimms must be organized as 8 128Mx8 dimms on each side. personally, I'd pick my ram from this page http://www.crucial.com/store/listparts.aspx?model=D975XBX the stuff you buy through their guaranteed compatability program WILL work.