Tom's Hardware > Forum > Graphic & Displays > ATI > DVI to DVI Problem...
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ryanmission   10-07-2009 at 07:38:51 AM

So, i just bought the XFX Radeon HD5870. I hooked everything up, both PCIe 6pin connectors, and powered up.

Problem:

When i plug my monitor in via DVI[Card] > DVI[Monitor], no signal.
When i plug my monitor in via DVI[Card] > Analog Adapter > VGA[Monitor], it works fine.

When i plug my HDTV in via DVI[Card] > HDMI[HDTV], no signal.
When i plug my HDTV in via HDMI[Card] > HDMI[HDTV], it works fine.
When i plug my HDTV in via DVI[Card] > Analog Adapter > VGA[HDTV], it works fine.


In summary, when i use the DVI cable or DVI port without an Analog adapter, nothing works. I get no signal to any displays. (This is not in Windows).

Any ideas?

Thanks


Message edited by ryanmission on 10-07-2009 at 05:24:10 PM
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ryanmission   10-07-2009 at 07:54:00 AM

http://www.avforums.com/forums/attachments/satellite-tv/130487d1248386820-dreambox-similar-dvi_connector_types.gif

Monitor: Dual Link DVI-D
Cables: Both Dual Link DVI-D and Single Link DVI-D
HD5870: Dual Link DVI-I

If this helps.

EDIT:

I found out this isnt just a 5870 problem, ive searched the endless seas of the web and found many with this problem dating as far back as 2005.

EDIT2:

Same problem with my old X600 DVI videocard.

Im beginning to think its software related.

Windows 7 64bit is the OS.

EDIT3:

I guess i'll also add, that this no signal thing isnt IN Windows. I cant see system info such as BIOS or POST...as well as Windows.

EDIT4:

Installed Windows XP SP3, still the same thing.

One thing is different:

I installed XP while i was using HDMI > HDMI on my TV (Since that works fine). When i plug in the additional DVI > DVI to my Monitor, the ATI Drivers, and the CCC (Catalyst Control Center) detects that there's another monitor plugged in, but i cant enable it. When i do, it just refreshes the screen, and its back to disabled. Same think for when i go into Desktop Properties>Settings and try to enable the monitor.


Message edited by ryanmission on 10-07-2009 at 06:50:54 PM
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ryanmission   10-07-2009 at 05:41:12 PM

bump/updated with more information.

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gamerk316   10-07-2009 at 06:56:27 PM

Hmm......I take it you made sure that the source of you're displays were set to digital? This is an odd one...

------------------------------ http://valid.canardpc.com/cache/banner/622598.png
 Reply to gamerk316
ryanmission   10-07-2009 at 06:59:05 PM

Yeap.

Im guessing thats why no one's jumping to help...im just as stumped.

I really dont want to have to call tech support >_<

Reply to ryanmission
ryanmission   10-08-2009 at 01:30:01 AM

My monitor's DVI port works fine on my friends 8800GT...wtf.

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gamerk316   10-08-2009 at 01:41:52 PM

Honestly, this is a really odd case...I'd almost have to chalk it up to the cable in this case...

------------------------------ http://valid.canardpc.com/cache/banner/622598.png
 Reply to gamerk316
ryanmission   10-08-2009 at 05:19:12 PM

The same cable was used to make it work at my friends house lol.

Both cables work on other monitors.
My monitor works from OTHER DVI inputs.
My TV works from OTHER HDMI inputs.
Both my 5870 and my x600 have this problem.

The ONLY piece of hardware that i can narrow it down to is the motherboard...there MUST be a BIOS setting or something...

Reply to ryanmission
ryanmission   10-09-2009 at 02:07:04 AM

Both videocard and DVI out's work perfectly fine in another computer.

i haven't the slightest clue as to whats wrong.......

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Anonymous   11-17-2009 at 05:45:48 PM

Have the same problem with windows 7 x64 here..

With Vista the ati 1950xtx card worked dvi - dvi
With Win 7 and ati 1950xtx, windows just ignored my previously working dvi connection and just worked with a vga adapter.
Upgraded gfx to a HD4770 but no change. But now not even bios/post shows without a VGA adapter.

This is some wierd shi*...

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