When you start up your machine, there should be a screen saying "Press [...] to enter setup." Usually at the bottom of the screen. The ESC, F1, F2 and DEL keys are the most common keys. This screen appears before Windows starts to load. Some machines do not show this screen. Instead, they show a logo of the builder. In that case it's a bit of experimentation to find out what key you have to press. When you have entered the BIOS setup, there should be a way to disable the onboard graphics chip. Where exactly you are going to find that option is hard to say, each brand and model of BIOS chip is different.

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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