Toshiba Satellite L455-S1591 Resource Manual page 30

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Adding memory (optional)
Installing a memory module
Memory modules can be installed in the memory module slots on
the base of the computer. You will need a small Phillips screwdriver
for this procedure.
The computer has two memory slots—Slot A and Slot B. You can
install one or two memory modules.
If the computer is on, begin at step 1; otherwise, skip to step 3.
1 Click Start.
Start button
(Sample Image) Shut down button
2 Click the Shut down button in the lower-right corner of the
Start menu.
The computer closes all open programs, shuts down the
operating system, and then turns off.
If the computer has been running recently, the memory module(s)
may be hot. The surrounding area may also be hot. Allow the
module(s) to cool to room temperature before replacing it. Avoid
touching the cover, the module(s), and the surrounding area before
they have cooled. Failure to follow these directions could result in
minor bodily injury.
To avoid damaging the computer's screws, use a small Phillips
screwdriver that is in good condition.
Installing a memory module with the computer's power on may
damage the computer, the module, or both.
Before you install or remove a memory module, turn off the computer
using the Start menu. If you install or remove a memory module
while the computer is in Sleep or Hibernation mode, data will be lost.
For this model, Slot A is the bottom slot. Slot B is the top slot. If only
one memory module is to be installed, it must be installed in Slot A.
Shut down button