Lenovo IdeaCentre K4 series User Manual page 62

If your computer has a single graphics card installed, follow the steps
below to replace it:
a. Remove the screw that secures the graphics latch to the chassis and open
it.
b. Remove the screw that secures the graphics card to the chassis.
3
2
1
c. Remove the graphics card by pulling it straight out of the connector.
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