2.Slide the module firmly into the slot at a
NOTE: If the memory module is not installed properly, the computer may not boot.
1 | tab | 2 | notch |
NOTICE: If the cover is difficult to close, remove the module and reinstall it. Forcing the cover to close may damage your computer.
3.Replace the base cover (see Replacing the Base Cover).
4.Slide the battery into the battery bay, or connect the AC adapter to your computer and an electrical outlet.
5.Turn on the computer.
As the computer boots, it detects the additional memory and automatically updates the system configuration information.
To confirm the amount of memory installed in the computer, click Start 
® Help and Support® Dell System Information.
