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it happened today when i changed my refresh rate from geforce control panel and was playing gamesNot nearly enough info. But I'm assuming that your computer is really new. If so, contact Omen (HP) about this as this shouldn't happen to a new computer.
I cant change it back because it doesnt start upChanging it back doesn't fix the problem? Pink lines shouldn't be happening even if you lower your refresh rate. Regardless, is the system still under warranty? If so, contact Omen for further troubleshooting.
Where should I contact hpIn that case definitely contact Omen/HP.