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plug in 2nd card and computer wont turn on?

post #1 of 9
Thread Starter 
I have been searching for a few days now, consulted a few friends whom have similar sli setups and am still stumped. I have two 480gtx cards and am trying to configure an SLI setup. My problem is that when I have both cards plugged in w/ the power connectors my PC simply wont turn on. I have tried using different connectors, different locations on the power supply, swapped pci slots. Both cards work when they are hooked up individually though. I do not have an SLI bridge(shipped and on the way though). Is there something I should try next or am doing wrong? I figure it would be something simple from keeping my pc to power on when both cards are hooked up. Thanks.
post #2 of 9
Not having the bridge should not matter towards starting up.

Gosh this is puzzling...tho only thing I can think of would be if your power supply isn't putting out the power it should or if the mother board has an issue with two cards.

When you say it won't power on do you mean it will do absolutely nothing when you press the power switch? No fans twitching or anything?

have you tried running one card at a time in different PCI slots? maybe one PCI-E slot is bad.
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post #3 of 9
Thread Starter 
No fans, no post test, nothing. You can "hear" the powersupply when you press the power button but that is it. Nothing happens at all. You can hear it for half a second.. like it tries to power on but just stops.
My motherboard has lights on it for the "GO" and "overclock" buttons(crosshair formula) and those lights turn off when you press the button. I turn the powersupply off manually then back on and those two lights will come back on but still nothing happens when you try to power on again unless you unplug one of the cards.

Am I not using the correct pci slots? I have been googling this and looking at other peoiples set ups and mine is identical.
Edited by wyant50 - 11/8/11 at 9:19am
post #4 of 9
That definately sound like something is shorting out or that the power supply has troubles then.

Do happen to have an old PCI-E GPU laying around? One that might not use much power? plug that in with a 480 and see if it powers on. If it does, then that pretty much limits it to your PSU.

And it does work with a 480 only in the bottom slot?
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post #5 of 9
Thread Starter 
Works with a 480 in the top and bottom slot if they are powered individually. Unfortunately I don't have a separate card laying around to test.

Let me try something though just to make sure.. If I'm not back in 10 minuets you know why lol.
post #6 of 9
Thread Starter 
ALL SYSTEMS GO!
Problem solved, bummed a certain power cable out of my dads pc build since he doesn't need it. At least I know what cables are bad and/or not very good. Double checked everything and it seems like all is well. Woot.
Edited by wyant50 - 11/8/11 at 9:54am
post #7 of 9
Quote:
Originally Posted by wyant50 View Post
Well this confirms my 2nd card is working and working well, now why won't they both work when they are both plugged in?
When you tried each card individually, did you use the same set of 6/8 pins? (forgot what 480s use)

if so, id test one or the other using a different set, there might be one that is loose/bad for some reason that is causing a short and not letting your system power on.

EDIT: damn you ninja. good that you got it working!

Also; i remember when i got my 260 not plugging the 6 pins in still allowed me to power on, but it made a horrible horrible shrieking noise from the mobo onboard speaker...
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AudioAudio
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CPUMotherboardGraphicsRAM
i7-2670QM Clevo P151HM1 Base nVidia 560m 8GB 
Hard DriveOptical DriveCoolingOS
Corsair Force 3 240GB Combo Way too weak. Win 7 Pro x64 
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post #8 of 9
Good to go...figured there had to be a shorting out.
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post #9 of 9
have to tried googling if you should change your IOH voltages?
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