VGA works, DVI doesn't

shokinezu · 10-03-2008, 01:50 PM

I'm not actually sure if this is a video card problem or somewhere else, but it's affecting my video cards. I turned on my computer one morning and the monitor did not receive a signal from the video card. There have been no problems with my hardware before this whatsoever, and no warning signs. One morning it simply decided to stop working. This is my 4-month-old eVGA 9600GT card. After testing various monitors and monitor cables to ensure that those were not the problem, I swapped out the video card for my old 7600. This worked fine, but only if I used the VGA port on it. Worth noting is that my 9600 has only DVI ports. The 7600 has a DVI and a VGA port, but only the VGA port works. If I use the DVI port I get the same "no signal" message as on the 9600 card. Any clues as to what my problem is? I've already changed out the CMOS and flushed the BIOS, neither of those has helped. Any help would be much appreciated.

**manic** · 10-03-2008, 02:21 PM

List all hardware specs, power supply wattage and brand also.

**wrench97** · 10-03-2008, 02:34 PM

Is your monitor vga and your using a dvi to vga adapter? If so try a different adapter.

shokinezu · 10-04-2008, 12:59 PM

Oh right, forgot specs.
m2n4-SLi Asus mobo
(currently) 7600GT card
AMD Athlon 64x2 3.1 GHz CPU
Thermaltake 550w PSU
Acer monitor
2 HDs, C drive is 120g Seagate, D is 700g seagate, no OS installed

And the problem isn't my monitor being VGA, my monitor supports both VGA and DVI, but only the VGA works. Since my 9600GT card ONLY has DVI ports, I can't get a signal. This isn't a setup problem, because i'd been using the 9600 for about 2 months before I got this problem.

**wrench97** · 10-04-2008, 01:40 PM

Well the DVI is totally controlled by the video card so if you have checked the monitor and cable using a DVI out on another PC it will be a card problem It's hard to believe that 2 cards won't out put DVI but there is nothing on the MB that would make that occur, I'm assuming it also does not output on the Bios splash screen?

shokinezu · 10-05-2008, 02:45 AM

That's correct, it will display absolutely nothing. As soon as I turn on the computer the monitor flashes, says "No Signal" and then hibernates. I don't have another card to test it, but for both the 9600 and the 7600 the DVI ports do not work, but the VGA port on the 7600 does. And up until 3 days ago, both cards were working fine with the DVI ports. Is it at all possible there was a driver update that caused this? I didn't install any drivers on purpose, but maybe it was a scheduled Windows update? I really don't know.

**wrench97** · 10-05-2008, 03:12 AM

No a windows update wouldn't do it.
Do you have a dvi to vga adapter? Try using the adapter on the on the vga cable of the monitor to the 7600 card you have installed currently.

shokinezu · 10-05-2008, 06:13 PM

I do have a DVI to VGA adapter, and using the VGA cable on my monitor to the DVI port on either of my video cards produces the "no signal received" message. It's definitely not a problem with any of the monitors or cables I have tried.

**magnethead** · 10-05-2008, 06:27 PM

Quote:

Originally Posted by shokinezu

I do have a DVI to VGA adapter, and using the VGA cable on my monitor to the DVI port on either of my video cards produces the "no signal received" message. It's definitely not a problem with any of the monitors or cables I have tried.

are you sure the DVI input on your monitor is working? Have you tested it on a known working machine?

shokinezu · 10-06-2008, 06:13 PM

Hmm, no I haven't. I guess that will be the next thing I try. Would it be possible for that to go out overnight though? Because that seems to be what happened. Actually I know that's not the cause of the problem. I used the VGA adapter, so when using the VGA port on my monitor to the DVI port on either of the cards, I get no signal.

**magnethead** · 10-06-2008, 07:14 PM

Quote:

Originally Posted by shokinezu

Hmm, no I haven't. I guess that will be the next thing I try. Would it be possible for that to go out overnight though? Because that seems to be what happened. Actually I know that's not the cause of the problem. I used the VGA adapter, so when using the VGA port on my monitor to the DVI port on either of the cards, I get no signal.

but that's still the analog VGA signal. I'm thinking your digital processor in the monitor may have died from overheating or something.

shokinezu · 10-06-2008, 07:46 PM

Alright, I'll give that a shot on my buddy's rig. Thanks for the idea, will post back tomorrow

shokinezu · 10-09-2008, 02:11 PM

Yeah, the monitor works fine on a working computer. Also I've tried plugging a VGA-only monitor into either of my video cards to the DVI port (using an adapter) and it still gives the "no signal" message. Should i chalk this up to freakish coincidence and RMA my 9600 card?

**wrench97** · 10-09-2008, 02:34 PM

Yes I would Rma it.

10-03-2008, 01:50 PM	#1 (permalink)
shokinezu Registered User Join Date: Oct 2008 Posts: 10 OS: XP service pack 2	VGA works, DVI doesn't I'm not actually sure if this is a video card problem or somewhere else, but it's affecting my video cards. I turned on my computer one morning and the monitor did not receive a signal from the video card. There have been no problems with my hardware before this whatsoever, and no warning signs. One morning it simply decided to stop working. This is my 4-month-old eVGA 9600GT card. After testing various monitors and monitor cables to ensure that those were not the problem, I swapped out the video card for my old 7600. This worked fine, but only if I used the VGA port on it. Worth noting is that my 9600 has only DVI ports. The 7600 has a DVI and a VGA port, but only the VGA port works. If I use the DVI port I get the same "no signal" message as on the 9600 card. Any clues as to what my problem is? I've already changed out the CMOS and flushed the BIOS, neither of those has helped. Any help would be much appreciated.

10-03-2008, 02:21 PM	#2 (permalink)
manic Mod Hardware Team Join Date: Aug 2005 Location: Florida Posts: 5,537 OS: xp	Re: VGA works, DVI doesn't List all hardware specs, power supply wattage and brand also. __________________

10-03-2008, 02:34 PM	#3 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 24,827 OS: Win7	Re: VGA works, DVI doesn't Is your monitor vga and your using a dvi to vga adapter? If so try a different adapter. __________________ Power Supply and Selection

10-04-2008, 12:59 PM	#4 (permalink)
shokinezu Registered User Join Date: Oct 2008 Posts: 10 OS: XP service pack 2	Re: VGA works, DVI doesn't Oh right, forgot specs. m2n4-SLi Asus mobo (currently) 7600GT card AMD Athlon 64x2 3.1 GHz CPU Thermaltake 550w PSU Acer monitor 2 HDs, C drive is 120g Seagate, D is 700g seagate, no OS installed And the problem isn't my monitor being VGA, my monitor supports both VGA and DVI, but only the VGA works. Since my 9600GT card ONLY has DVI ports, I can't get a signal. This isn't a setup problem, because i'd been using the 9600 for about 2 months before I got this problem.

10-04-2008, 01:40 PM	#5 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 24,827 OS: Win7	Re: VGA works, DVI doesn't Well the DVI is totally controlled by the video card so if you have checked the monitor and cable using a DVI out on another PC it will be a card problem It's hard to believe that 2 cards won't out put DVI but there is nothing on the MB that would make that occur, I'm assuming it also does not output on the Bios splash screen? __________________ Power Supply and Selection

10-05-2008, 02:45 AM	#6 (permalink)
shokinezu Registered User Join Date: Oct 2008 Posts: 10 OS: XP service pack 2	Re: VGA works, DVI doesn't That's correct, it will display absolutely nothing. As soon as I turn on the computer the monitor flashes, says "No Signal" and then hibernates. I don't have another card to test it, but for both the 9600 and the 7600 the DVI ports do not work, but the VGA port on the 7600 does. And up until 3 days ago, both cards were working fine with the DVI ports. Is it at all possible there was a driver update that caused this? I didn't install any drivers on purpose, but maybe it was a scheduled Windows update? I really don't know.

10-05-2008, 03:12 AM	#7 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 24,827 OS: Win7	Re: VGA works, DVI doesn't No a windows update wouldn't do it. Do you have a dvi to vga adapter? Try using the adapter on the on the vga cable of the monitor to the 7600 card you have installed currently. __________________ Power Supply and Selection

10-05-2008, 06:13 PM	#8 (permalink)
shokinezu Registered User Join Date: Oct 2008 Posts: 10 OS: XP service pack 2	Re: VGA works, DVI doesn't I do have a DVI to VGA adapter, and using the VGA cable on my monitor to the DVI port on either of my video cards produces the "no signal received" message. It's definitely not a problem with any of the monitors or cables I have tried.

10-06-2008, 06:13 PM	#10 (permalink)
shokinezu Registered User Join Date: Oct 2008 Posts: 10 OS: XP service pack 2	Re: VGA works, DVI doesn't Hmm, no I haven't. I guess that will be the next thing I try. Would it be possible for that to go out overnight though? Because that seems to be what happened. Actually I know that's not the cause of the problem. I used the VGA adapter, so when using the VGA port on my monitor to the DVI port on either of the cards, I get no signal. Last edited by shokinezu; 10-06-2008 at 06:15 PM.

10-06-2008, 07:46 PM	#12 (permalink)
shokinezu Registered User Join Date: Oct 2008 Posts: 10 OS: XP service pack 2	Re: VGA works, DVI doesn't Alright, I'll give that a shot on my buddy's rig. Thanks for the idea, will post back tomorrow

10-09-2008, 02:11 PM	#13 (permalink)
shokinezu Registered User Join Date: Oct 2008 Posts: 10 OS: XP service pack 2	Re: VGA works, DVI doesn't Yeah, the monitor works fine on a working computer. Also I've tried plugging a VGA-only monitor into either of my video cards to the DVI port (using an adapter) and it still gives the "no signal" message. Should i chalk this up to freakish coincidence and RMA my 9600 card?

10-09-2008, 02:34 PM	#14 (permalink)
wrench97 Moderator, Hardware Team Join Date: May 2008 Location: S.E. Pennsylvania Posts: 24,827 OS: Win7	Re: VGA works, DVI doesn't Yes I would Rma it. __________________ Power Supply and Selection