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No signal with dvi/hdmi with certain displays

Last response: in Graphics & Displays
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April 12, 2012 2:26:47 PM

Hello,

for starters, I apologize for my poor English. I will try to explain the better I can.

Mobo: Gigabyte GA-880GM-UD2H
Graphics: Integrated ATI Radeon HD 2450

Digital outputs (HDMI and DVI) work only with some (new?) displays. I have tried 5 displays and only work with 2 of them, the newest ones.

By VGA runs fine and if I plug a second display I can see in Windows that it recognizes perfectly both displays, but no image in the digital one. Restarting doesn't fit anything. Neither the preOS or BIOS screen is showed, absolutely nothing never.

It doesn't make sense for me. I don't know what else I can try.

Thank you all
a b U Graphics card
April 12, 2012 3:18:53 PM

I think you will find your problem is with DRM (Garbage, but forced to live with) Built into windows 7 and HDCP.
When connecting using DVI or HDMI the system will check/verify that the monitor is HDCP enable, if not it will "refuse" to send a signal to the monitor.
So if the Monitor must be HDCP enabled, old monitors are not.
http://en.wikipedia.org/wiki/High-bandwidth_Digital_Con...
a b U Graphics card
April 12, 2012 3:54:04 PM

Windows 7 only imposes the HDCP restrictions on Bluray content. It should still display something even with a non-HDCP compliant display.
Related resources
a b U Graphics card
April 12, 2012 5:51:52 PM

Had old Viewsonic monitor, worked great with XP, but would not display anything with windows and win 7 - But could have been someting else.

Also had a Blu-ray player that refused to work with a NON HDCP TVs, Even if playing DVDs or watching a standard TV broadcast.
April 12, 2012 9:33:11 PM

@RetiredChief But I can't see BIOS neither POST screens (before loading windows)... if it was hdcp I could see them and I would lost the signal later, no? (And considering you are right, because I think @aicom is)

Besides, I have more new graphic cards that certainly support HDCP and work flawlessly with these displays.

Any other idea? I can't find nothing on the Internet about this.

Thanks and regards
!