dual HD 5770 not working in xfire

[CaptCanada]

I have two HD 5770 cards, one MSI and one XFX. I have them connected in xfire but when I boot there is no video out, but the computer is booting as I can see the hd light coming on.

With just the XFX card installed/connected, the system boots into windows okay. I have a Ultra 600watt power supply. Each card has at it's own 12v connector.

Not sure what is going on. Any ideas ?

thanks!

 

[MoMeanMugs]

I have two HD 5770 cards, one MSI and one XFX. I have them connected in xfire but when I boot there is no video out, but the computer is booting as I can see the hd light coming on.

With just the XFX card installed/connected, the system boots into windows okay. I have a Ultra 600watt power supply. Each card has at it's own 12v connector.

Not sure what is going on. Any ideas ?

thanks!

Which one is the primary card? Did you try switching the monitor cable to the other card?

 

[CaptCanada]

The XFX card is my primary. I haven't tried connecting the monitor to the second card. I will give a try

 

[Spikesoldier]

if you have two dvi ports on the card, try the other dvi port on the primary (top) card.

i would then attempt to reseat the cards and cf connector if that doesnt work.

 

[CaptCanada]

I connected the monitor to the second videocard, and got my video display. I am not familiar with crossfire, this is my first dual videocard setup actually. I had read that it doesn't matter what videocard you use for your display, maybe in this case it does?

 

[IGemini]

My guess is your power supply. Ultra is more junk than not, and every "600W Ultra" PSU I'm finding has anemic 12v rails.

 

[CaptCanada]

I went into my bios and found that I had to set the third PCIE slot to X1 to enable the second slot, as when it is on auto that slot is disabled. Crossfire then was available and I enabled it in CCC

Now though, after I had the cabling all tied up and stowed them, there is no crossfire and no video from either card now. There is power to the cards and I have even unplugged power to my second card, but still no video from the first card. I haven't physically removed the second card yet, that is today's job.

Any ideas?