Replaced RAM in my Dell Dimension 4700. Went from 2 256 MB modules to 4 1GB modules. Tried them all at once at first but got an Intel screen, and no Windows boot. Installed the originals and everything worked fine -so no damage to mother. Installed 2 of the new in slots 1 & 2, & worked. F2 setup showed 2 GB, & control pnl showed 2 GB. Installed a 3rd in slot 3, with the same result -F2 setup showed 3 & so did control pnl. When I installed the 4th though, F2 setup showed 4GB, but my control pnl is only showing 3GB. The computer is listed as being able to handle 4GB, so I don't understand. My thoughts are maybe, because I installed to the first time, then the 3rd, & then the 4th, I need to install the 3rd and 4th together, & not one at a time. Any thoughts?