Lenovo IdeaCentre B300 - Manual (Page 39)

Chapter 8. Replacing hardware
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3. Disconnect all cables attached to the computer. This includes power
cords, input/output (I/O) cables, and any other cables that are
connected to the computer. Refer to “Locating connectors on the rear
of the computer”.
4. Remove the computer stand. Refer to “Removing the computer stand”.
5. Lift up the computer cover gently from the bottom right corner to
release the cover from the setscrews .
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Replacing the hard disk drive
Attention
Turn off the computer and wait 3 to 5 minutes to let the computer
cool down before replacing the hard disk drive.