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Problems with the Radeon 4890.

Last response: in Graphics & Displays
August 29, 2009 5:15:58 PM

Hello all. I am having a problem with my Radeon 4890 video card. First off I have 2 computers. One is an Intel E8400 w/ a Asus P5q-pro motherboard. I also have an AMD Phenom II 940 w/ a Biostar (not sure of the model) motherboard. I have 2 video cards. One is a Nvidia GEForce GT 9600 and the other is the ATI Radeon 4890. I can get the Nvidia card to work fine in either computer. The Radeon 4890 will only work with the AMD Phenom/Biostar combo. When I place the Radeon in the E8400/Asus combo there is no video output. The card receives power and the fan spins. When the card starts up I see the red lights on it light up and then go away. I know the PSU is good because it works fine with the other card and the Radeon is receiving power. I have re-seated the card many times but this does not fix the issue. I also reset my CMOS but I still do not get any video coming out of the Radeon when its in the Intel/Asus combo. I have tried HDMI and VGA and neither displays anything. Anyone have a clue as to whats going on? Thanks in advance!!

More about : problems radeon 4890

a b U Graphics card
August 29, 2009 5:47:58 PM

Does your 4890 have a 6 pin and 8 pin connector for power? Or two 6 pins? And are they both plugged in?
August 30, 2009 10:05:54 PM

It has two 6 pin connectors. I have tried them both individually on the Nvidia card so I think everything is good. Any other ideas of what could be wrong?
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a b U Graphics card
August 30, 2009 10:20:06 PM

Driver leftovers?
August 30, 2009 10:57:40 PM

individually? havent you tried plugging two of them at the same time?
a b U Graphics card
August 31, 2009 12:28:31 AM

What is the wattage / amperage on the two PSU's? A 9600GT uses a hell of a lot less power than the 4890 does.
September 1, 2009 9:46:15 PM

I don't think this has anything to do with drivers since I can't even get to the BIOS (therefore drivers aren't being loaded by an OS yet). When I said I tried the plugs individually I meant on the 9600 (it only uses 1, I did this to prove that both of the adapters work). The card WORKS on the 650 watt OCZ PSU but does NOT WORK on the 700 watt OCZ PSU (this one is newer as well).
a b U Graphics card
September 1, 2009 10:40:52 PM

... gotta ask simple things just in case

You are using the blue pcie slot on the Asus P5q-pro for both graphics cards?
September 7, 2009 3:26:16 PM

Yeah everything is hooked up correctly. I am just giving up and putting the cards in the computers that works :( 
July 21, 2010 6:48:38 PM


I was looking around on Google and noticed that you had the same problem I am having now. Did you get it fixed? How did you get it working?