Dell Inspiron 11z (1110, Mid 2009) - Manual (Page 34)

4. Replace the keyboard (see Replacing the Keyboard ).
5. Replace the battery (see Replacing the Battery ).
6. Turn on the computer.
To confirm the amount of memory installed in the computer, click Start ® Help and Support® Dell System Information.
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NOTE: If the memory module is not installed properly, the computer may not boot.
1 memory module connector 2 tab
3 notch
CAUTION: Before turning on the computer, replace all screws and ensure that no stray screws remain inside the computer. Failure to do so may
result in damage to the computer.