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Radeon 4850 - no monitor signal on boot

post #1 of 6
Thread Starter 
My Sapphire 4850 (see sig), which is connected to my monitor via HDMI <-> DVI, seems to have developed a very strange malady lately (it was working perfectly before). When the computer is turned on or rebooted, the monitor loses signal all the way through POSTing. Yet the video signal returns when the computer reaches the Windows logon screen. The motherboard seems to be fine, as I can still get my full boot sequence back if I connect the monitor to the IGP's monitor ports (whew!). I have tried resetting the board CMOS, and reflashing the video card, with no success. The card also seems to be stable - I'm running Kombuster on it right now with no problem. Is this card defective or what?
Edited by kz26 - 6/16/10 at 8:12pm
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post #2 of 6
I actually had a similar issues when I had my Gigabyte 4850 and I was using the HDMI output on it when I would start the computer the HDMI would not become active and I would have to unplug it and plug it back in to go away.

I can't remember 100% what I did to correct the issue, but one thing I remember finding was there are HDMI Audio drivers for ATI that I didn't have installed.

I have read a lot of a lot of issues with 4850 and HDMI (and ATI's HDMI in general) and I would think it's probably the connector itself or drivers somehow causing the issue, but I'm not sure.
    
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post #3 of 6
Thread Starter 
What's even stranger is that there seems to be a correlation between the physical orientation of the card/computer and whether the monitor will receive output.

If the tower is in a normal upright position, there is no signal.
If the tower is on its side, I can usually get the monitor to display properly.

Also, I don't think it's a driver issue since the loss of output occurs only during the BIOS/POST sequence. Would it be worthwhile to try a DVI-DVI cable instead?
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post #4 of 6
Thread Starter 
bump. Anyone have ideas on what is causing this (very strange) problem?
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post #5 of 6
Necro time! I also have intermittent problems with the 4850x2. It's just speculation, but it appears the issue involves inadequate power at boot, as it never manifests when windows is loaded...only when I'm trying to boot into post. If anyone found a solution, please do holler at your boy; I'm totally stumped right now, because I'm installing a new mobo and can't let Windows load since it's not installed smile.gif. What a headache.
post #6 of 6
Update for posterity: it was not the GPU. Though the problem above still persists occasionally, in this case there must have been some contact between the mobo and the case, as removing all components and booting them on a glass table was successful.
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