The error could come from 1 bad stick of ram or multiple sticks of ram with errors. What you can try to do is take out all of the RAM except for one stick and then try to boot. If it works, set that stick aside and try the next stick of Ram in the same slot. If one of the sticks of ram will not boot, that could be the bad one. If all of the sticks of ram work in the first ram slot, then test with the second slot, then third, etc because it could be a bad RAM slot on the motherboard as well. You can also try running the Dell diagnostic tools as well, which you can download from support.dell.com for your specific computer. On some versions of their software, it can tell you which stick of RAM has gone bad.