I recently dealt with a very peculiar problem. There was an HP Envy 23, an all-in-one, that had stopped connecting to Bluetooth devices. I tried updating all relevant drivers - Bluetooth, USB roots, chipset - and rebooting, and running troubleshooters, and changing settings, and nothing worked.
I had been using the touchscreen to work with it. To make sure that Windows hadn't suddenly decided to reject real mouse and keyboard input, I plugged in a USB mouse. Shockingly, everything started working again. I suspect this is because the Bluetooth emitter is connected internally via USB, and plugging in a new USB device somehow made Windows figure everything out.
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