It definitely sounds like you're having issues with conflicting or incompatible drivers. Make sure you've downloaded the latest drivers from the nvidia website, the version you get through Device Manager can be years out of date. Make sure you've uninstalled and disabled any existing drivers before running the nvidia installer, and be aware that if you boot up with a monitor connected to the integrated video Windows will reinstall its <ADMIN NOTE: Profanity removed as per TOU> drivers automatically.
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