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System won't post with 6750 installed

Gorilla

[H]F Junkie
Joined
Sep 14, 2007
Messages
8,528
So I recently sent my xfx 8800GT alpha dog edition card to XFX for RMA. They sent me back a 6750 1gb ddr3 card. So I popped it into my spare desktop and I discovered that if the 6750 is in the PCI-E slot the system won't POST. Fans start to spin for a few seconds and then everything turns off, then it starts again, then turns off, so on and so on. It never stays on long enough to beep or Post or anything. I put a spare 8600gt into it and it started immediately. So do I have a bad card? Do I get to deal with XFX again. It took them an entire month to get me a replacement for my 8800gt and I would really rather not deal with them again.

I can't be a driver problem because the system never stays on long enough for drivers to have anything to do with it, not to mention that I did a clean install of windows 7 this morning.
 
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Sounds like a power issue to me. Whats the wattage difference between both cards?
 
Definitely not a power issue. I just put my 4890 in there and it worked immediately and I'm pretty sure that the 4890 consumes a hell of a lot more power than a 6750.
 
Clean the gold pins on the video card with an eraser. Then try resetting the bios on your mobo. What mobo do you have anyway?
 
might be a stupid question, but do you have the 6-pin power plugged in?
 
Clean the gold pins on the video card with an eraser. Then try resetting the bios on your mobo. What mobo do you have anyway?

I'll give that a shot. I've reset the bios to default settings recently if that is what you mean. I'm not sure what board it is. It's some random cheapy ECS board that came in a Fry's combo a couple years ago.

might be a stupid question, but do you have the 6-pin power plugged in?

It is plugged it.
 
Sounds like a bios thing to me.
Make sure you disable the on board graphics if it haves one on it.
It would help to tel us what motherboard it is.
And also check the boot order of PCIE.
 
Are you sure it's just not taking a really really long time? Back when I upgraded my 8800gtx to a 5770, it would take 30-45 seconds to post with the fans spinning up/down before hand. A bios update fixed it though. It was a M2N32 board
 
Sounds like a bios thing to me.
Make sure you disable the on board graphics if it haves one on it.
It would help to tel us what motherboard it is.
And also check the boot order of PCIE.

Motherboard is an ECS 945GCT-M V:3.0. I updated the bios to the latest version and it didn't change anything.
http://www.ecs.com.tw/ECSWebSite/Pr...x?DetailID=830&CategoryID=1&MenuID=16&LanID=0

Are you sure it's just not taking a really really long time? Back when I upgraded my 8800gtx to a 5770, it would take 30-45 seconds to post with the fans spinning up/down before hand. A bios update fixed it though. It was a M2N32 board

I am completely sure. It starts to run for about 15 seconds and then power cuts off to everything. The case fans stop, the cpu cooler fan stops, the hdd stops spinning, everything just dies. Then it turns on again, runs for 15 seconds, dies, etc. At no point at during this 15 second process does it POST, beep, display anything on the screen, or give any indication that it is actually working. I let it run for a few minutes and it just repeats that cycle. If I put my 4350, gt240, or 4890 in the system it posts within about 3 seconds of being turned on and I'm at my desktop in around 20 seconds.
 
First of all did you try those changes in the bios that i told you to do?
did you try that card on another motherboard?
what i mean by that a more recent motherboard :p
Just to make sure they have not sent a defect card and then to move on to find the cause of the problem.
 
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You need to play with this settings:
insert the graphics card that posts,go to bios PCI/PnP Setup,Init Display First select pci card ( if there is an option in there that say PCIE set it to that one)
save it and try again.
If that does not work,repeat the process in order to go into to your bios,go to PCI/PnP Setup Allocate IRQ to PCI VGA set it to No.after this it will work i think.unless you have a defect card.
 
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