Question

Dual Monitors - HDMI Port "No Signal"...But Kinda Still Does

Hello All!

Alright. So I've scoured the Google-webs and come up empty. You guys are my next shot at this...

I've got an ASUS desktop with these specs:
-- Windows 8.1
-- 32GB DDR5 RAM
-- NVidia GeForce 750ti Graphics Card
-- Dual Monitors
-- (Will be happy to provide more info if needed, but this should be the pertinent stuff)

So, I'm a video editor by trade. And for a while, I was using one computer monitor connected via the DVI port and a small TV connected via HDMI. Worked perfectly for more than two years. Long story short, I bought a new monitor to replace the TV. Worked fine...for a while.

What I'm running into is perplexing, to say the least. The DVI monitor is working flawlessly. However, sometimes, when booting up, the computer recognizes the HDMI monitor and works fine. Other times, it doesn't and only uses the DVI monitor. Now, the HDMI monitor simply just won't play nice with the other kids. Right now, I'm looking at a black screen on my left that's getting "HDMI No Signal". And that just won't do, especially as a video editor.

I thought it was a bad HDMI port on my graphics card. But wait! There's more! When booting, the HDMI monitor displays the BIOS. I've putzed around in my computer's BIOS like a champ on my HDMI monitor. However, the instant Windows 8.1 kicks in...Nothing. The signal goes dark.

I've exhausted what I know to do and I need your help. But, to stem off some FAQ's that I know are coming, here's what I've attempted so far...

-- The most reliable fix was just to unplug and replug the HDMI cord from the back of the computer. This worked for a while; but now, I can't even get that to work.
-- I've restarted my PC more times than a Kardashian has received plastic surgery. Every monitor configuration. Every way. Same result.
-- It's not the HDMI cord. I checked. Moreover, being able to see the BIOS on my HDMI monitor backs that theory up.
-- I thought it was a bad HDMI port on my graphics card, but it's not. I can still see the BIOS, remember?
-- Tried a Google-recommended "HDMI reboot". Unplugged power cords from the back of both the PC and the HDMI monitor as well as the HDMI cord on both ends. I let it sit for one minute, then replugged and rebooted. No change. Thanks, Google...
-- Maybe it's the monitor itself? Nope. I even swapped connections on both monitors. DVI conistently works fine, while HDMI continues to throw a hissy fit.
-- Windows 8.1 does not recognize that there's a second monitor any more. Display Preferences only shows the one monitor.
-- I'm not seeing the monitor in Device Manager. Just the NVidia graphics card.
-- Along that note, I updated the graphics card drivers yesterday. Came up empty again.
-- I've checked the BIOS's APM settings. Nothing except three items to choose from. No need to turn on either booting by RTC or PCIe, and the other option (the name escapes me at the moment) was set correctly.

I'm stumped. No idea what to do from here. Maybe someone out there in cyberspace can see something I'm not. Any help you're willing to give is appreciated more than you know.

Thanks in advance!
anjmcp

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Comments
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Answer
I've seen this on some Samsungs.

Why it happens is a bit of a mystery but try this.

Unplug that HDMI cable, then unplug the power to the TV for about a minute to have the HDMI chips forget the HDCP handshake (what a horrible idea that was.)

Apply power, HDMI and try again. If that clears it up then it's the TV and their choice of HDMI chips.

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Been There, but Tried it Again...

I tried the HDMI reboot before, but what the heck? Free advice, right?

Sadly, it did not work. Still looking at a signal-less ASUS monitor.

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Since old display was fine

Make it a reason to change out that display. I'm not there to check settings in Windows but I've lost count of settings off by a smidge.

So the TV still works? It's the display so back that goes.

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Last Resort

I'll call that the plan of last resort. I'd hate to have a perfectly good monitor lying around if I can help it.

But what bugs me is that it's not the monitor itself; it's something with the HDMI connection. Remember, I've already swapped connections on my monitors to see if it was a hardware issue. The problem consistently stays with whichever monitor is using HDMI.

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HDMI means HDCP and once in a while

You find that a display card won't play with a TV or display. It can drive folk crazy. Here we know about that and swap card or display. Only the newer techs think it's a setting, well it could be but I take it you went over that.

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Answer
Problem Solved

Hey Guys,

The problem was answered for me just a few days ago. I don't know the details, but apparently the problem laid in a NVideo GEForce driver that was recently updated. Both monitors now boot fine. All is well.

Thanks for your help!
anjmcp

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