Over the past few years I've had most all of my M4600 or other M series HDMI port refuse to put out a signal. I've had several company visitors bring their Dell laptops in and if they are M series laptops will not communicate with our overhead projectors via HDMI. The projector simply says NO SIGNAL. Yet on the same projector when I connect my E5450 it will project just fine. This happens when using a TV using HDMI as well.
In all cases it SEES the projector or TV screen as a second monitor. I've popped open the PROJECT app and told it to MIRROR the screens. I can see the monitor add itself to DEVICE MANAGER when plugging in the HDMI cable and see it leave when unplugging it. This happens with Windows 7 and Windows 10.
I had a an old M4600's connected it to my TV. It worked for months on Windows 10 then suddenly would no longer put out a signal over HDMI. Again, I can see the TV by correct name in Device Manager when it's plugged in, I tell it to MIRROR or even EXTEND the desktop and nothing happens but NO SIGNAL on the TV. I pulled out an even older M4600 one that had been offline for about a year and it worked until MS did updates. I went through the Dell updates and Windows updates and will no longer work - NO SIGNAL.
I put a brand new fresh Windows 10 image on the first laptop (that I had been using for months) and it no longer works - with a brand new image from MS. I tried updating the vid drivers from Dell, still no signal. I tried drivers directly from Nvidia with the same results - NO SIGNAL. Again, I hooked my Win 8.1 E5450 to the same TV and it projects fine. As does an older Inspiron with Windows 10.
I cannot get any M series laptop to project out it's HDMI port on two different projectors and 1 TV, while the same TV / projectors work just fine with an E series and Inspiron series laptop. I tried 4 different HDMI cables, ALL work with the E series and Inspiron, NONE wok with any M series laptop.
I have no idea what's going on here. Any ideas?
We cannot speak to the untested Windows 10 on this 2011 PC. We have no idea what drivers Microsoft would push for Windows 10 or how they will react with this older hardware. We can only troubleshoot the ones with Windows 7. Are you using Fn + F8 to switch to the TV/projector? Also, Nvidia Optimus must be Enabled.
Yes, I am using FN+F8 and or WIN+P (same thing) and telling it to DUPLICATE or EXTEND and neither one does anything.
The ones with Win 10 used to work, the one with Win 7 also used to work until I allowed it to be updated with MS updates.
I will double check the Nvidia Optimus settings, as far as I know it is still enabled and always has been.
We cannot know what updates were pushed on to these systems by Microsoft. Obviously something that they installed broke it. You can try to roll back the updates hoping to remove the faulty update, then turn updates off.