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New Crossfire setup black screen after windows logon

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Need some help, I have just installed a 2nd Sapphire VaporX 7950, both cards are plugged and are connected with 1 crossfire connector. PC powers on fine and gets to the Windows logon screen then the screen goes black, any ideas what the issue is?
 

Phusius

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disconnect the CF bridge. reboot. connect the CF bridge while PC is still on, go to AMD CCC and enable CF. update drivers, reboot.

done
 
Joined
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System Name Ryzen Reynolds
Processor Ryzen 1600 - 4.0Ghz 1.415v - SMT disabled
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Memory Vulcan T-Force 16GB DDR4 3000 16.18.18 @3200Mhz 14.17.17
Video Card(s) Sapphire Nitro+ 4GB RX 580 - 1450/2000 BIOS mod 8-)
Storage Seagate B'cuda 1TB/Sandisk 128GB SSD
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Case Corsair Carbide Series SPEC-01
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Benchmark Scores https://www.3dmark.com/spy/6220813
Would of got back to you sooner though have had no end of problems, my Windows installation was corrupted to the point where it would get to the logon prompt and BSOD every time, different BSOD's from RT64win7.sys, ks.sys, kbdclass.sys etc, was fine on safe mode and a system restore fixed the BSOD's though I was unable to open CCC and have now done a clean install. Just about to install AMD drivers so will update when I'm done (fingers crossed)
 
Joined
Apr 21, 2010
Messages
5,731 (1.13/day)
Location
West Midlands. UK.
System Name Ryzen Reynolds
Processor Ryzen 1600 - 4.0Ghz 1.415v - SMT disabled
Motherboard mATX Asrock AB350m AM4
Cooling Raijintek Leto Pro
Memory Vulcan T-Force 16GB DDR4 3000 16.18.18 @3200Mhz 14.17.17
Video Card(s) Sapphire Nitro+ 4GB RX 580 - 1450/2000 BIOS mod 8-)
Storage Seagate B'cuda 1TB/Sandisk 128GB SSD
Display(s) Acer ED242QR 75hz Freesync
Case Corsair Carbide Series SPEC-01
Audio Device(s) Onboard
Power Supply Corsair VS 550w
Mouse Zalman ZM-M401R
Keyboard Razor Lycosa
Software Windows 10 x64
Benchmark Scores https://www.3dmark.com/spy/6220813
Update, after a clean install of Windows and updating for an hour I have just managed to install latest (13.1) drivers and Crossfire is also working, time for some benches :D :toast:
 
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:toast: I could see you finally decide to install... could you share temps please.... and your experience about your xfire 7950's :toast:
 

Aquinus

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I was about to say, the card your display was plugged into was most likely the disabled adapter. Switching the display to the other video could have fixed it without reinstalling Windows. Glad to hear you got it to work though. :toast:
 
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