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I have an old computer that is experiencing graphical related corruption as well as randomly restarting.

In an attempt to isolate the problem I want to disable the GPU so it reverts to the chipset inbuilt into the motherboard.

I have tried disabling the GPU in the device manager, but it still requires that I plug my monitor into the GPUs monitor output port, which seems to indicate to me that it isn't truly disabled.

How would I go about disabling it?

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up vote 7 down vote accepted

You should be able to disable it in the BIOS. They vary between companies and models so I can't give you a definite location, but it will be in the section for video.

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Pull it out of the motherboard, perhaps? Can't get more disabled than that, and there's no chance of the OS interfering before it's had a chance to realise that no, it shouldn't be using it.

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Check for "Primary display device" or something to that effect in the BIOS. Usualy you'll have options like On Board, PCI, PCI Express or AGP.

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