My story with struggling with this is very long so I will try to make it as detailed but short as I can. I have a GTX 770 Classified (brand new) and I was trying to do a dual display and it wouldnt work. The "top" DVI port works but the bottom one does not. Tried new drivers, uninstalling/reinstalling no success, so I had it RMA'd. When I received the new GPU, same issue persisted. So I tested the card in a different PC and the card worked fine with no problems. So my testing continued. "Top" DVI port worked, "bottom" did nothing, and the HDMI was even more interesting... When solely connected to the HDMI, off boot, the BIOS emblem along with Windows emblem would show for about 2 seconds but then the screen would go black although it continued to boot. So next I tried software fixes, but could not solve it. So I installed Linux to try and remove windows from the equation and still could not get it to work. So next I tried the monitors. I tested and both work along with both cables working. So next I thought maybe the power supply, so I booted into the BIOS to check the voltage readings and the 12V components was powered at 12.15V which is well withing range. So next I did a memory test just because and had no problems there. Finally I was able to get my motherboard RMA'd thinking it was a bad PCI bus or slot. The motherboard is an ASUS Extreme VI. Upon arrival after the RMA, they sent the same board (same S/N), so I asked if they found issues or what. They said they did find some problems and fixed them, after final testing they shipped it back. Great news! till I tried it and nothing has changed. I have an Intel 4670k processor so I doubt that is the issue. I dont know if ASUS fixed anything or not but I have no idea what to do. Everything is new and higher quality so the issues shouldn't be happening. I've tried to upgrade and downgrade the ASUS BIOS version and yet to no avail. I know the problem isn't with the GPU and that this is an EVGA forum, but there are a lot of smarter people than me here and I just need help. I will try or test anything. Is there something I should change in the BIOS? If you need more info please let me know. I'm very frustrated through this long process and paying for shipping components that do not resolve the issue i'm having. Please and thank you for your help!
 
My rig:
Motherboard: ASUS Extreme VI Hero
Processor: Intel i5 4670k
GPU: EVGA GTX 770 Classified
Memory: Corsair 16 Gb
SSD: Crucial M500
PS: Corsair Gold 750Watt
Monitors: 2x Asus VS238H-P
 

I have not tried "different" cables, but I was able to test both monitors/cables into the port that was working. So from that I verified that both monitors and cables worked, but only one at a time from the single working DVI slot. 
Edit: Plus the HDMI port is funny on both monitors and the cable for sure works. I use it all the time.

bob16314

jakoh77
Is there something I should change in the BIOS?

 
Welcome to the forums..Although you shouldn't have to change anything in the BIOS because the mobo is supposed to auto-detect when a graphics card is installed and configure accordingly, you could try changing the Graphics Configuration -> Primary Display from the default of Auto to PCIE and see what happens..It's in Advanced -> System Agent Configuration.

Thanks, I will try this when I get home tonight and let you know. Still accepting other suggestions though =] Thank you Bob!

Try the GTX 770 in the PCIE_X8_2 (middle) slot and see how it goes. 

bob16314
Try the GTX 770 in the PCIE_X8_2 (middle) slot and see how it goes. 

Tried the second PCI slot and no luck (although I have 4 slots). I talked to customer service and they directed me to a page where they list compatible GPU's with this motherboard. The link is here:
 
[Well it doesnt like my link]  but here is the list that it shows: 
 
nVidia chipset - EVGA -  
EVGA 250GTS512MX16
EVGA GEFORCE 8600GT-256M
 
I am not sure I completely understand it, but I went down to nVidia chipset and EVGA to look at compatible cards. Do you think my card is considered compatible or not? I don't see why it wouldn't be since I've seen many with a build like this but otherwise I couldn't find much. Customer service also had me enable something called iGPU in the BIOS and multi monitor? Not sure what it is but that didnt fix it either. The whole thing is weird since nothing appears to be broken. Any other ideas from anyone? They did offer to RMA it again but that would cause me to tear it down and pay to ship it AGAIN and I'm not even convinced that they will fix it. Thanks for your help. 

wmmills
We need to know some things....have you done a clear cmos with both monitors connected and then booted to bios and manually setup voltages/timings etc... on your cpu/ram etc... ? When you tried the gpu in a different pc, did you do a dual monitor setup like your trying to do with the problem pc, or did you just try one monitor to make sure the gpu was ok? Did you try the other dvi slot in the other pc if only one monitor test? Have you tried hooking one monitor to dvi-d on the gpu and the other to hdmi, instead of the other dvi on the gpu? Your sure both monitors are defaulting themselves to the correct port on there config panel?

I have not done a clear cmos with both monitors, but I have tried to check/install drivers for them and that's it. I haven't done any manual voltage/timing set up, mainly because I wouldn't know what to change them too. Normally with an intel set up I don't NEED to tweak the voltage settings. But either way it is a new concept to me but I am willing to try if you give me instructions. As for when I tried it in a different PC... I plugged in both monitors via DVI during boot and after it booted, both screen came on. I may have had to install the GPU driver first, but both monitors were on at the same time. So that tells me that both slots work. As for testing on MY pc, I have tried each port individually and every combination including dvi-d and hdmi. When I did the dvi-d and hdmi, the hdmi did nothing at all, but the working dvi port worked as expected. Each time I tested I made sure the monitors were set to "DVI" or "HDMI" accordingly. it just says "No signal detected" and trying to "Detect" in windows results in nothing. I have tried both monitors individually with DVI into the working port and they both work. Which tells me that both cords and both monitors work fine, just the one DVI (bottom) port does not work. But as I said above, one interesting thing about the hdmi port is when I only have a monitor plugged into the hdmi and boot, the ASUS bois screen shows along with the Windows 8 flag for roughly 2 seconds before the screen goes black. But it continues to boot correctly with a black screen and then the monitor will display "No signal detected" so it is losing signal for some reason during boot. 

wmmills

jakoh77

wmmills
We need to know some things....have you done a clear cmos with both monitors connected and then booted to bios and manually setup voltages/timings etc... on your cpu/ram etc... ? When you tried the gpu in a different pc, did you do a dual monitor setup like your trying to do with the problem pc, or did you just try one monitor to make sure the gpu was ok? Did you try the other dvi slot in the other pc if only one monitor test? Have you tried hooking one monitor to dvi-d on the gpu and the other to hdmi, instead of the other dvi on the gpu? Your sure both monitors are defaulting themselves to the correct port on there config panel?

I have not done a clear cmos with both monitors, but I have tried to check/install drivers for them and that's it. I haven't done any manual voltage/timing set up, mainly because I wouldn't know what to change them too. Normally with an intel set up I don't NEED to tweak the voltage settings. But either way it is a new concept to me but I am willing to try if you give me instructions. As for when I tried it in a different PC... I plugged in both monitors via DVI during boot and after it booted, both screen came on. I may have had to install the GPU driver first, but both monitors were on at the same time. So that tells me that both slots work. As for testing on MY pc, I have tried each port individually and every combination including dvi-d and hdmi. When I did the dvi-d and hdmi, the hdmi did nothing at all, but the working dvi port worked as expected. Each time I tested I made sure the monitors were set to "DVI" or "HDMI" accordingly. it just says "No signal detected" and trying to "Detect" in windows results in nothing. I have tried both monitors individually with DVI into the working port and they both work. Which tells me that both cords and both monitors work fine, just the one DVI (bottom) port does not work. But as I said above, one interesting thing about the hdmi port is when I only have a monitor plugged into the hdmi and boot, the ASUS bois screen shows along with the Windows 8 flag for roughly 2 seconds before the screen goes black. But it continues to boot correctly with a black screen and then the monitor will display "No signal detected" so it is losing signal for some reason during boot. 

Im not familiar with your board so I would rather see someone else help you set up the bios in it. Not that I couldn't wing it but someone who has it will know what settings work or don't etc... better than I will. Did you check the ports on the gpu and the cords to make sure theres no bent pins that might be missing when the cord gets plugged in? ive seen that happen quite a few times to people. also, are there any sleep or hibernate settings that may be interfering from the bios? are you on win 8 or 7? 64 bit?

Well i tried new cords in general and still same problem. Plus all the pins seem fine. I did look into the bios and didnt find much other than it has some "Multi monitor" setting to enable, which I did but it didnt change anything. I also found something called iGPU? not sure what it is but I tried different settings with that and still no luck. I did not find any sleep settings that appear to be interfering with the bios. Also I am using windows 8.1 64bit. I've also tried Ubuntu 14.04 and same problem. I'd be willing to try windows 7 if you think it may help. Other than that I am still fresh out of ideas. I'm at the point where I would buy a new motherboard, but I'm not even sure that is the problem! Thanks again for everyones help.

Please edit your posts to included paragraphs so people can read them easy?