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Call dell for warranty service - if the touchscreen isn't being detected, and you haven't done a factory recovery - they will insist on that first, so you may want to try it before calling for support. Update your drivers and bios/uefi firmware from pc or motherboard maker's support downloads web page, using the full model number, serial number or dell service tag on sticker. My 7270 latitude touch screen stopped working shortly after first use after win update worked again but for a short time.
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