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Touchscreen stopped working + no HID in device manager + Unknown USB device

Hi,

My 7270 latitude touch screen stopped working shortly after first use (after win update worked again but for a short time).

All drivers are up to date.

In device manager a USB device shows as unknown (yellow warning triangle), otherwise there are no indications to the source of the problem.  There is no other touch screen device showing in device manager. 

How do I perminently solve this?

Thanks


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