Two Radeon HD 4870 X2's NO DISPLAY

My system specs

Asus P5E3 Premium/WiFI-AP@n
-Intel Core 2 Extreme QX9770 3.2GHz 12MB Cache 1600MHz FSB
-600GB (2 x 300GB) WD Velociraptor SATA 3.0Gb/s 10,000RPM 2 x 16MB Cache
-2 ATI Radeon HD 4870 X2 graphics gards
-Corsair XMS3 DHX TWIN3X4096-1600C7DHX 4GB DDR3 2X2GB DDR3-1600 CL 7-7-7-20 dual channel memory kit
-Thermaltake 1200W PSU

This is a new build. I'm trying to get my 2 Radeon HD 4870 X2's to work in CrossFire. Problem is When I have the two cards plugged into my motherboard I get nothing! No display at all just a blinking monitor :fou:. Each card works fine on their own in whatever slot I stick them in. Why am I getting nothing when they're both in? What can I do to fix this. The CrossFire cable is connected and all the power connections are made.
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More about radeon 4870 display
  1. try booting with one and install all drivers properly, if not already. Not sure if it will help, but could.
  2. Ok, I sorted this out I'm getting a display now. I think I might of just jumped the gun a little lol.
  3. awsome! kick ass mobo you got there *jelous*
  4. how the **** you afford all this ****???
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