Are the ram kits the same speed and do they have the same timings?
Try the following if you know how to mess around in the BIOS, if you don't know how you will have to find someone.
1.) Try loading fail safe defaults in your bios with the 4 gigs in there and see if you get the same results and make sure the fail safe defaults disables any memory or system overclocking.
2.) Try updating your motherboard bios to the latest revision.
If all else fails try to disconnect all none essential devices like hdd drives, cdrom, pci cards etc but leave the 4 gigs in there and see if it does the same thing.
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