I've had a Yoga 2 Pro (running 64-bit Windows 8.1) for a few months. I usually have it hooked up to an external monitor via HDMI. I disconnect and reconnect it all the time. This machine has the Intel 4000 onboard graphics.
All of a sudden today, it no longer recognizes that an external display is connected. It could be related to an automatic Windows update that was performed while it was disconnected. Here are some details of symptoms and what I've tried:
- I tried uninstalling the display drivers and reinstalling the version from Lenovo's site
- Normally I would right-click on the desktop, select Graphics Options, then "Output To", and I'd have a number of options. But now the "Output to" menu is completely gone.
- I've tried with another monitor (my TV). As soon as I connected it, the TV recognized that something was hooked up (i.e. it gave me a message "something is hooked up on HDMI2" - but when I switch the input there, there is no signal).
Any suggestions?