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I guess it's possible that your laptop doesn't have all drivers available to support Windows 10. We have one like that. It's one of those ones where you can remove the screen and the screen becomes an android tablet leaving the base as a Windows machine that you can plug an HDMI monitor into. We tried upgrading it to Windows 10, and that functionality was impossible to get going. It turned out that the driver only supported Windows 8 and no higher. So back to Windows 8 we went, and we suffer that operating system on that machine to this day.
Take a look on the Lenovo website to see if you can find the drivers for your machine and see what OS they support. There might still be a chance. Windows will probably be using a generic driver. If you find the right driver for Win10 on the Lenovo site, try installing it.
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