Yesterday I have connected external display Asus VW192C to my laptop Dell XPS 14-L421X via HDMI-to-DVI-D cable. And it worked perfectly fine from start. The day after, Asus screen went blank showing "No signal". Every time I connec/disconnect the cable or power off/on the display it says "No signal". And I didn't change any system configurations meanwhile.
To troubleshoot the problem, I have tried to connect laptop to TV (hdmi-to-hdmi) – it was fine. I've tried to connect a different laptop to the display via the same cable – worked fine as well. So its obviously something on system level, either Windows or graphics drivers. Also it seems that Windows still see the external display (I can move mouse pointer away from the main screen in Extended mode into "dark" screen), but there's just no signal.
Any ideas? What else to try?
PS.
My laptop has 2 graphics cards – GeForce 630M and Intel HD 4000 using NVidia Optimus technology. I have updated to latest Intel and NVidia drivers, still didn't help.
PPS. Although I shouldn't have updated (from Intel support):
"our Intel generic graphics drivers from the Intel website do not support using both Intel Graphics 4000 and NVidia GeForece GT630M". Nevertheless, it should not affect connectivity to additional display.
Best Answer
Do you have a single cable with HDMI Male on one end and DVI-D Male on the other end? If so, then it's not a proper HDMI-compliant cable. The HDMI consortium only certify HDMI female outputs, HDMI female inputs, and HDMI-male-to-HDMI-male cables.
Buying real HDMI-certified gear, with logo, helps. If you can, try a real HDMI cable, with an HDMI female to DVI-D male adaptor.
I learned this lesson at work, where someone responsible for the projectors in the conference rooms had bought a bunch of non-HDMI-certified hybrid cables that went from mini DisplayPort male to HDMI male. They rarely worked. They were later replaced with real HDMI certified cables and mini DisplayPort male to HDMI female adaptors, and that solution worked reliably.