Hey, this is my first post on these forums, and I'm sorry if this has already been posted, but I haven't been able to find any information about this.
I have just recently started to build my first computer. I obtained some help from some knowledgable computer friends and when I booted up my computer for the first time, everything worked perfectly. I also successfully installed all the drivers.
E6700 Core2 Duo, Antec 550w power supply, Radeon X1900 XTX, and a Viewsonic Monitor.
After the success, I decided to make a crossfire out of it. With the help of my friend, I installed new X1900 crossfire card and put the X1900 XTX in the 2nd PCIE slot as the Asus manual instructed. When I booted up the computer, I was able to install the Crossfire Master card, but when I tried to get the computer to recognize the X1900XTX card, it froze and went to a black screen. Then when I booted up the computer again, I couldn't load windows and had to go into safe mode to delete the drivers.
I double checked the manual and all the connections, and fired it up again. Again when I tried to install the drivers, I got another black screen freeze. The computer seems to recognize the Crossfire master card and X1900XTX card as individual cards, but whenever I try to get it to recognize the X1900XTX Card in the secondary slot it would freeze.