Troubleshooting Amd Crossfire - AMD Radeon HD 7850 User Manual

7.1.1.5 The computer boots up but there is no display.
7.1.1.6 During software installation on a PC with the Windows Vista® OS, the screen
goes blank

7.1.2 Troubleshooting AMD CrossFire™

7.1.2.1 Change Motherboard BIOS Settings
7.1.2.2 Use Graphics Cards with Different Amounts of Memory
7.1.2.3 Card Reversal Recommended