Installed new 4870 GPU in M17, getting blank screen.

I bought compatible 4870 cards MXM 2.1b for my M17.

Installed the 4870 cards properly but having problems.

After booting up the cards were detected as 4870 and drivers were updated. After rebooting I'm getting a blank screen after windows loading bar comes up.

In safe mode, I uninstalled the drivers, ran driver sweep, and reboot successfully back into Windows. However everytime I update drivers it will give me a blank screen after rebooting.

I uninstalled drivers again in Safe Mode, rebooting, and am looking at GPU-Z.

Both cards are listed in GPU-Z, however, one card doesn't show any shaders or filrates. The other card shows all information. ATI Crossfire is disabled in GPU-Z.

Everything is installed correctly including the Crossover cable. This seems like a driver issue but I don't know how to get around it.
Does anyone know what's the problem and have any solutions?

 

Have you tried plugging an external monitor before rebooting the system?

If you get nothing, take the secondary card out, leaving the primary in the system, install the graphic drivers and see what you get.

 

Are you suggesting the second card is dead? I am on one card now because I didn't install driver for second card. If I do I'm pretty sure it will go blank on reboot. What could be causing this?

 

I believe that the M17 can run if both cards are flashed with master vBIOS, i can't recall from the back of my head, so before you try what i'm going to advise you, get ahold of a slave vBIOS as a backup.

Now i would suggest you flash the second card with the same vBIOS as the primary card and see what you get.

 

The seller says the vBios is fine and tested it in his M17 before sending. If it's not the vBios what could the culprit be?

I disabled my second card in Device Manager and can use updated driver with 1920x1200 but still can't play games without errors.

 

So does the laptop work fine with a single card in?

Have you tried running each card alone in the primary slot?

Are you using the drivers from AMD's site or Windows update? Perhaps try the one you are not using.