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New 5770, DisplayPort turns off other monitors

post #1 of 18
Thread Starter 
Just picked up a new video card, the Radeon HD 5770.

Supposedly, with Eyefinity support, I can use three monitors on this video card via 2x DVI and 1x DisplayPort.

I have installed and updated the drivers, so the two DVI monitors work fine. I also have a DisplayPort to HDMI adapter, and then an HDMI cable going to a TV to use as a third monitor. However, it seems that when I plug in the DisplayPort cable, my two monitors will lose signal, and the TV will still display nothing. Even if I unplug the DisplayPort cable, nothing will be fixed until I reboot the computer, and only then will I get signal again.

Is there something I am missing?
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post #2 of 18
Thread Starter 
I guess I should also mention I am just trying to extend my desktop to the third monitor via DisplayPort. Doesn't necessarily need to be with Eyefinity.
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post #3 of 18
Which display port adapter are you using?
post #4 of 18
Thread Starter 
Quote:
Originally Posted by simplec6 View Post
Which display port adapter are you using?
It's a passive DisplayPort to HDMI adapter. I've read that I may need an "active" DP to HDMI adapter. Is that true?
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post #5 of 18
Yes, you will need at least a single active DP conection to run 3 monitors
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post #6 of 18
Display Port adapter http://www.newegg.com/Product/Produc...-030-_-Product

Mini Display Port adapter http://www.newegg.com/Product/Produc...-034-_-Product
Pick whatever one you need, yes it NEEDS to be ACTIVE....Problem Solved
Edited by Theory - 6/12/11 at 1:57pm
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post #7 of 18
also try restarting after you configure your monitors, but yes you need an active DP adapter.
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post #8 of 18
Yea you need the active one... i had the passive and i had the same problem.
    
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post #9 of 18
Thread Starter 
Here's what I had: http://www.walmart.com/ip/Siig-CB-DP...apter/13215726

Bummer. So, not all "Active" DP-HDMI adapters have a power supply? It seemed like all the ones people were linking off of sites found via Google were linking and/or saying that the way to tell an Active from a Passive was the Active had a power supply. I suppose that isn't the case?
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post #10 of 18
I have a sapphire active DP port... DP to VGA i got it on newegg for like 20 bucks.
    
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