Owner's Manual (PDF)
Page 28
... Memory Module(s) CAUTION: If the memory module is not installed correctly, your computer during a memory upgrade, keep them separate from any new module(s) that you may have, even if you purchased the new module(s) from Dell. CAUTION: If you remove the original memory module(s) from your computer may not start properly. Otherwise...
... Memory Module(s) CAUTION: If the memory module is not installed correctly, your computer during a memory upgrade, keep them separate from any new module(s) that you may have, even if you purchased the new module(s) from Dell. CAUTION: If you remove the original memory module(s) from your computer may not start properly. Otherwise...