Switching between displays...internet dies

[ghost recon88]

My parents have a home built PC that has a C2D 5200, 4GB of RAM, and a Radeon HD 5450 video card with both DVI and HDMI out. Running Windows 7.

Normally they use a 22" Acer widescreen monitor, and with that display configured everything works fine. However occasionally my dad uses my Dish account to stream both ESPN and Big Ten Network online, and when doing so he likes to use their 32" Samsung TV to display the picture. He does this by hitting Windows + P, then selecting the option to only display the picture on the TV. Both the TV and monitor are always plugged into the video card, it's just the TV is disabled except for when streaming sports.

The problem we've ran into is, when opting to use the TV as the primary display (or even extending the desktop over into the TV and still using the Acer LCD) the internet just doesn't work. All the browsers say "unable to resolve DNS" and just hang. However as soon as you do Win + P and opt to only use the single Acer monitor, the internet browsers start working again.

Updated both the Ethernet driver, and video card driver, still no difference. Super weird issue and I can't find anything on the internet about it.

 

[sm625]

Wow. Another Win for Windows. I would try a USB ethernet adapter just to see if it happens on another adapter. Or try a pci card if you have one of those.

 

[Azix]

tried a different port on the TV? Using HDMI for the TV?

 

[96Firebird]

Might be an HDCP issue, what is the TV model?

 

[SolMiester]

I would try including google 8.8.8.8 in your DNS list

 

[Phynaz]

Post results of ipconfig /all for both a working and non working display.

And ask a mod to move this to the correct forum, it belongs in networking.

 

[ghost recon88]

tried a different port on the TV? Using HDMI for the TV?

I've tried a different HDMI port, same thing.

Might be an HDCP issue, what is the TV model?

Samsung 32" F5500 LED

I would try including google 8.8.8.8 in your DNS list

I will try that, and also post up ipconfig screenshots for both scenarios.

 

[ghost recon88]

ipconfig shows the exact same config for both panels, gonna try hooking up a laptop next and seeing what happens.

 

[cytg111]

Wow .. i cant come up with anything else but what 96Firebird stated. Friggin weird. (another win for drm?)

 

[Phynaz]

Try nslookup with both connections. Let's make sure it's a network issue. You could also try pinging other devices on the network. Do they have a router? Is it reachable in both cases?

 

[tweakboy]

It just doesn't meant to be

 

[Eymar]

Unlikely, but maybe HDMI Ethernet channel being an issue: http://www.hdmi.org/manufacturer/hdmi_1_4/hec.aspx. Unlikely as both TV (probably supports it) and videocard (probably not) have to support it and also cable has to support it, but maybe something to eliminate. If TV has built-in wifi or ethernet connection disable them or any network related settings on tv if TV is not connected to internet.

 

[ghost recon88]

Just an update. It was a bad HDMI cable (non-ethernet HDMI cable too). Don't know why I never tested that, but the old cable passed over video and audio just fine. Eventually, the HDMI cable was the only thing to test, and sure as heck swapping it out to a newer one and I got the same download speeds no matter which display I was using. Super super weird....

 

[xorbe]

That is just bizarre.

 

[Phynaz]

Yeah, that's a weird one.