Lenovo K450e Desktop - Manual (Page 34)

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Step 5. Remove the graphics card by lifting it straight out of the connector.
Step 6. Install the new adapter into the same adapter connector and secure it to chassis with the screw.
Step 7. Turn the graphics card latch to the closed position and secure it with the screw.
Step 8. Reattach the graphics card fixing bracket and computer cover.
Replacing the Power supply
Note: For this procedure, it helps to lay the computer flat.
To replace the Power supply:
30 Lenovo K4 SeriesHardware Maintenance Manual