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No picture through DVI after using HDMI

drunkenmunky

drunkenmunky

drunkenmunky

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9 Apr 2006
Posts
232
I connected my 4870 to my big tv for the first time today using HDMI. But now, when I go back using DVI on my computer monitor I get no picture. All I get is a black screen. DVI worked before so why not now? Please help.

Update: Problem Solved!

I did a lot of googling to find the solution.
If you have the same problem as me then try this method:

1) Shut down the computer.
2) Disconnect your monitor from the graphics card and the mains.
3) Disconnect the power supply from the back of the monitor (this resest the monitor)
4) Re-connect your monitor to the mains and the cable (DVI) to the graphics card.
5) Turn on your computer.

You should now have your DVI signal back. If that doesn't work you can try using a tool called "DVI Recover"
 
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Does the screen start black and stay black?
Or does it start OK and then turn black during windows loading?

If the latter, start in safe mode and delete the monitor from the device manager, then reboot. If that doesn't do it, delete the video card as well (no need to uninstall drivers, you just need to force a redetect/re-init).

Also worth noting that sometimes you get a blackscreen boot on the 4800's when you make system changes, this is sometimes followed by a bsod, or auto-reboot, but will fix itself next time. That may just be the machine I was working on tho.
 
Sorry, and if it's the former of those, try starting with no monitor plugged in once, then plug back in. Also try the other DVI port, both families of card can get funny ideas about which DVI is the default (took quite a while to get my 8800 to use the DVI that's not knackered).
 
thegoonden said:
Does the screen start black and stay black?
Or does it start OK and then turn black during windows loading?

If the latter, start in safe mode and delete the monitor from the device manager, then reboot. If that doesn't do it, delete the video card as well (no need to uninstall drivers, you just need to force a redetect/re-init).

Also worth noting that sometimes you get a blackscreen boot on the 4800's when you make system changes, this is sometimes followed by a bsod, or auto-reboot, but will fix itself next time. That may just be the machine I was working on tho.
Click to expand...

It starts black and stays black. I have to forcefully turn off the PC. I'm still using HDMI now but will remove the card or monitor from device manager then reboot using DVI.

Will let you know if it works.
Thanks
 
plug it back into the hdmi then deselect that somehow! switching back to DVI then apply it screen should go blank then sht down PC then reconnect DVI, but otherwise I would normally have my 27" DELL and 32 inch samsung TFT TV plugged in switching betwwen the 2 or dual screen, I once unplugged my TV cable and notice no picture Black , may be the problem your looking for.
 
thegoonden said:
Sorry, and if it's the former of those, try starting with no monitor plugged in once, then plug back in. Also try the other DVI port, both families of card can get funny ideas about which DVI is the default (took quite a while to get my 8800 to use the DVI that's not knackered).
Click to expand...

Tried using both ports, still nothing. Uninstalling the graphics card and the monitor from Device Manager also did nothing.
 
siege2 said:
plug it back into the hdmi then deselect that somehow! switching back to DVI then apply it screen should go blank then sht down PC then reconnect DVI, but otherwise I would normally have my 27" DELL and 32 inch samsung TFT TV plugged in switching betwwen the 2 or dual screen, I once unplugged my TV cable and notice no picture Black , may be the problem your looking for.
Click to expand...

I had a look at my graphics cards settings but you can't choose between HDMI and DVI, it's enabled to detect which sort of display you're using but it's not detecting DVI even though it worked before I started using HDMI.
 
drunkenmunky said:
Tried using both ports, still nothing. Uninstalling the graphics card and the monitor from Device Manager also did nothing.
Click to expand...

Aye, if it's black from powerup onwards, drivers wouldn't be to blame.

Further to what Seige2 suggested.............
Originally, did you change the connections while the machine was off?#

If so, his suggestion is a good one, but the way to select between them is to hotplug while the macihe is on.
Don't worry, it won't cause trouble, I spent ages changing fron VGA to HDMI to DVI with two machine connected to one monitor (each was tried every which way), both machines remained powered up and unflustered.


Naturally if doing any plugging at the card end, be careful not to waggle it too much or disturb it in it's socket.
 
What was the last resolution output you used over HDMI? If 720p or 1080p you may need to put the HDMI back in and set it to a new monitor compatible resolution before using DVI again.
 
Thanks for the replies. I was using 1080p before switching back to DVI. I have changed the resolution to the lowest setting but still doesn't pick up my DVI connection. I have tried all the suggestions above, removed the main display from Catalyst Control Centre, swapped displays, swapped cables while the machine was on, I have even set the graphics card settings to factory default but still nothing.
I have taken a picture below from Catalyst Control Centre. At the moment the Clone display (Panasonic TV) has a picture. The resolution is set at 576p. The Main display (Computer Monitor) has no picture (no signal). I'm stuck with what else do except format my HDD.

20u4cy8.jpg
 
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formating your hdd wont help if the boot screen doesnt even display.

edit: the only thing i could think of is that if you can manually change the output device on CCC then try doing it using your keyboard buttons. Find out what buttons to press to change it when using hdmi, then when starting in DVI press the buttons in the order that is needed. (at work just now so cant be much help atm).

but tbh it doesnt sound like the drivers that are the prob.
 
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Xiler said:
formating your hdd wont help if the boot screen doesnt even display.

edit: the only thing i could think of is that if you can manually change the output device on CCC then try doing it using your keyboard buttons. Find out what buttons to press to change it when using hdmi, then when starting in DVI press the buttons in the order that is needed. (at work just now so cant be much help atm).

but tbh it doesnt sound like the drivers that are the prob.
Click to expand...

I did that too, I swapped the cables over then while I had no picture, I manually set my computer monitor as my main display. It wasn't that hard to do but it didn't work.
It's not the drivers as I have just removed them and the software.
I am going to try system restore now then if that doesn't work I'll load my Windows backup that I made a few days ago.
 
System Restore didn't work but I think I have found the problem, though not sure how to fix it.
I have gone through the basic quick setup in CCC rather than the advanced setup and it has deteced 2 displays. However, it thinks I have 2 Panasonic (HDMI) TV's connected. If I remove one then detect another, it still picks up a 2nd Panasonic TV. If I remove both displays it just detects the Panasonic again.
In Device Manager it shows 2 PnP displays connected. In CCC is shows 2 displays connected. If I extend my main display on to my clone display, the main one changes to the clone picture.
 
In the image above, your settings for primary display (which I am assuming is your monitor) has a resolution with a 25Hz interlaced refresh rate. That doesn't sound right, but could be wrong.

I would remove the second display and set up for your primary display, monitor at native res 60Hz. Then attach the 2nd display, and try, if possible to set that up with a different resolution being the native resolution and 60Hz.

Finally, from my experience, if your using the HDTV for desktop gaming always use the native res at 1:1 mapping. If you use 480p, 576p, 720p or 1080p/i then it wall always scale and look blurry unless watching video, when you can use the above res's.
 
HummuH1 said:
In the image above, your settings for primary display (which I am assuming is your monitor) has a resolution with a 25Hz interlaced refresh rate. That doesn't sound right, but could be wrong.

I would remove the second display and set up for your primary display, monitor at native res 60Hz. Then attach the 2nd display, and try, if possible to set that up with a different resolution being the native resolution and 60Hz.

Finally, from my experience, if your using the HDTV for desktop gaming always use the native res at 1:1 mapping. If you use 480p, 576p, 720p or 1080p/i then it wall always scale and look blurry unless watching video, when you can use the above res's.
Click to expand...

The refresh rate of my monitor is 60hz. It's a ViewSonic 21" 1680x1050 resolution. My Panasonic is 1080p.
I removed the Panasonic TV from CCC. It automatically selects the other display as the main one (computer monitor). I setup my computer monitor (had to remember what buttons to press while I had no picture) then rebooted my PC and connected my DVI cable. Still no picture so connected through HDMI again now.
 
Yes, that's exaclty what I did. Noting happend. But as soon as I connected the HDMI I had a picture. It still detects another display but it still thinks it's 2 HDMI displays and not 1 DVI.
 
I found out it's a known problem with ATI cards. Another forum was talking about this more than a year ago but looks like it hasn't been fixed.

"its an EDID issue. The PC looses the EDID info when you switch inputs and so it doesn't see a device connected to it any more and so it shuts off the connection."
 
I had this problem this morning. I bought a HDMI cable for my LCD TV as it only has 1 VGA port and my Xbox 360 also uses VGA so I switched the PC to HDMI. The cable isn't that good though, the picture looked terrible so I switched it back to the VGA port and got "No Signal". Nothing came through at all, so I switched back over to the HDMI cable and completely uninstalled the drivers for the graphics card (Sapphire HD4850) including the Catalyst Control Centre. Then I ran the Driver Sweeper program from Guru3D and turn the machine off.

After that I plugged in the DVI cable into the second port on the card, and just removed the HDMI cable but left in the DVI to HDMI adapator. Turned on the machine, and it worked fine and I'm currently on the VGA port.
 
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