Custom built PC, dGPU not working

Asus Mbd atx p8z68-v pro ddr3-lga1155 2x...
June 3, 2011 at 22:54:58
Specs: Havnt made it that far, i7 2600k, 16gigs
Hey, just built myself a new rig using ASUS P8Z68-V pro, intel i7 2600k, dual radeon 6870's 1g (MSI twin Frozr II) 16 gigs of crucial ballistix RAM

When i plugged everything in and tried to startup, I got 2 short beeps, and then no action on the monitor. Didn't know how to resolve this, so I just kept removing components. Disabled all SATA, went down to 1 stick of ram and 1 video card, still no luck.

Underneath my video card, the BOOT_DEVICE_LED stays lit throughought POST.

If i plug my monitor into my iGPU it will allow me to load BIOS.

I tried using both video cards individually in each slot, but no combination was fruitful.

Are both of my brand new video cards busted? or is something else at work here?

set PCIE/PCI as primary video device in the BIOS, but still nothing. Anyone know what to do?

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June 4, 2011 at 03:57:12
Two bad video cards, whilst not impossible, sounds extremely unlikely.

What make and model PSU are you using? Are you sure that it's up to the job?

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June 4, 2011 at 06:03:43
I agree that the PSU is most likely under powered. Each 6870 draws 10.6A from the 12V rail at idle and 17.6A at full load.

Add that to the almost 8A the CPU draws, fans, drives, etc.

The biggest load by far is on the 12V rail/s. A single 12V rail with around 50A is what you need.

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June 4, 2011 at 17:01:29
Sorry I forgot to mention. PSU is 800W silentpro Gold. It should be more than enough for this hardware. Also, I swapped out both of my graphics cards for a 5 year old model I had lying around, and it displayed just fine. I really think I got sold 2 faulty gpu's.

But I still havnt ruled out powersupply.
When I try to turn the machine on, all the fans will power up and it will start POST but then it will like fail somehow just shut down and startback up, and that will usually get me to the bios.

Before I go bring back these videocards. Anyone have any other suggestions?

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June 5, 2011 at 05:37:57
I came across something new to me in the features sheet at the Asus site for your board. you have something called "LucidLogix® Virtu". You also have integrated graphics. The afore mentioned technology may be responsible for your board not posting. Read up on it in your manual. You may need to make some settings adjustments in the BIOS.

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