Introduction
Use this guide to replace a faulty or outdated GPU, in this case, an NVIDIA GeForce GTX 970 in a HAF 912 case.
The graphics card, or GPU, is a piece of hardware that allows a computer to display images and videos more effectively. A failing video card can lead to crashes and issues running certain software.
Tools
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            Unplug all the external cables from the computer and ensure that the power supply is switched off. 
 
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            Remove the case side panel by applying pressure to the side and sliding the side panel toward the back of the case. 
 
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            Remove the GPU from the case. If it does not move, check to make sure that steps 3-5 were properly performed. 
 
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            Once the replacement GPU is lined up, press down until you hear a click or can see that the locking tab is flipped up again. 
 
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To finish reassembly, follow steps 2-4 in reverse order.