Windows 10: Why is my 2nd monitor no longer working?!

All I did was unplug my 2nd monitor for a second. Windows no longer recognises it. In fact it thinks my Dell monitor is just a generic pnp monitor whereas before it listed the name. The graphics card seems to work, the cables work, the monitors are on. So why does it no longer detect the 2nd monitor?!

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2nd monitor not working

My 2nd monitor was working fine. Now it is not. When I select display options, I am no longer given the option to extend the display. My 2nd monitor says it is not receiving input from my computer. It did just fine until a couple of days ago.

 

2nd monitor no longer recognised

Hi Pratiksha

Thanks for responding.

MY PC is ASUS Desktop PC A_F_K31ADE (64bit, 8gig RAM). Windows 10 Home edition.

Before anything else, I want you to understand that up until today I had no problem with display of my 2nd monitor. It was only after I disconnected and re-connected the VGA cable (over a different issue) that the connection was lost. I also never had this
problem with my previous PC which was retired only a few weks ago. I am using ther same monitors (Voewsonic VP2635 and 2nd is Viewsonic VA702 - an oldie but which has worked fine until now and is perfectly OK for my needs as a second monitor.

The error message on my 2nd monitor is "NO SIGNAL" in blue font, otherwise it is blank.

I have tried different VGA cables - one new and one which works on other PCs. There is no other socket on my VA702.

As you suggested I disconnected the primary monitor's DVA cable and rebooted but nothing changed.

If I right-click desktop - display settings - only monitor 1 shows and clicking detect gets "Didn't detect another display". Similarly no 2nd monitor shows in Devices; Device Monitor - Monitors.

Driver NVIDEA GeForce GT 710 messaage id thst driver is up to date.

If I go to NVIDEA control panel only monitor 1 shows and if I click on "set up multiple displays" there is no 2nd monitor showing. I clicked "detect missing display" (for older monitors etc) but nothing found.

In windows key/ P display settings I highlighted "extend" as choicer for display - nothing changed.Having looked through MS forums and also having googled my problem it is impossible to mescape the fact that there a thousands having the same problem as
I am and I cannot feel more frustrated as to go about my job I need 2 monitors. I find it hard to believe that with all the weeping and wailing from so many oters re this issue I am now stuck with a single monitor PC!!

I

 

Color Display on 2nd monitor

I am using Windows 10 on a Dell laptop with a 2nd monitor which has been working fine. For some unknown reason I have suddenly lost the full color range on the 2nd monitor. I don't know if I have changed some setting by accident or what. I have tried
resetting the defaults but that didn't change anything on the 2nd monitor. The primary screen on the laptop continues to work fine. Any suggestions what needs to be done to restore the full color range on monitor #2?