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Black screen after BIOS/Grub on 7950

post #1 of 3
Thread Starter 
I have two Gigabyte Radeon HD 7950 cards that have suddenly stopped working right after the BIOS and Bootloader screens (basically when the cards switch into a higher-resolution graphics mode from text/VGA mode).

I was originally running with one of the cards, and my system was stable. I had added the second one in with crossfire, and initially they worked fine. However, when using them under some amount of load, they started freezing up. After 3 or 4 of these freezes, I can no longer boot at all, even with only one card installed.

I can get into the BIOS fine, and the bootloader screen (I'm running Ubuntu) comes up, but once I try to boot, the screen goes black and never returns. Also, the fans on the cards start cranking up to full speed, so it seems like they are doing something. I tried booting from a USB stick with a fresh install of Ubuntu with the same result. I have tried both cards individually, with the same result. Since the bootloader comes up, and I am able to run the memory tester option (which is only text mode), it seems that my motherboard/processor/memory are working, although I do not have another video card to verify this.

Anybody have an experience like this? Is there perhaps some way to reset the cards. I find it hard to believe that two cards would die simultaneously, so it seems like it must be some bios/firmware issue.
post #2 of 3
I'm unsure of the Gigabyte 7950, but all the other branded 7950's come with dual BIOS, there should be a switch located on the edge of the pcb in the general area of the pci-e connectors. Switch it from the first setting to the next to have the cards load their "safe" BIOS settings which may be underclocked etc.
Edited by azrael36 - 5/16/13 at 8:20am
Dark Nova
(20 items)
 
 
New HAF-X Build
(37 photos)
CPUMotherboardGraphicsRAM
FX-8350 Black Edition ASUS 990FX MSI R7950 Twin Frozr III Boost Corsiar XMS 3 
RAMRAMRAMHard Drive
Corsiar XMS 3 corsair xms3 corsair xms3 crucial m4 ssd 
Optical DriveCoolingCoolingCooling
LiteOn DVD Burner antec kuhler 920 yate loon 120mm HS x4 yate loon 120mm MS x3 
CoolingOSMonitorKeyboard
cooler master 200mm windows 8 pro HP 2011x CM storm quick fire 
PowerCaseMouseAudio
thermaltake m smart series 850 watt cooler master HAF-X logitech m705 logitech G930 
CPUMotherboardGraphicsGraphics
Intel I7 3970X MSI Big Bang-XPower II LGA 2011 Intel X79  MSI R7970 TF 3GD5/OC BE Radeon HD 7970  MSI R7970 TF 3GD5/OC BE Radeon HD 7970  
CoolingMonitorMonitorMonitor
custom water cooling from various manufacturers HP 2011x HP 2011x HP 2011x 
PowerCase
PC Power & Cooling MK III 750 BitFenix Colossus Venom 
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Dark Nova
(20 items)
 
 
New HAF-X Build
(37 photos)
CPUMotherboardGraphicsRAM
FX-8350 Black Edition ASUS 990FX MSI R7950 Twin Frozr III Boost Corsiar XMS 3 
RAMRAMRAMHard Drive
Corsiar XMS 3 corsair xms3 corsair xms3 crucial m4 ssd 
Optical DriveCoolingCoolingCooling
LiteOn DVD Burner antec kuhler 920 yate loon 120mm HS x4 yate loon 120mm MS x3 
CoolingOSMonitorKeyboard
cooler master 200mm windows 8 pro HP 2011x CM storm quick fire 
PowerCaseMouseAudio
thermaltake m smart series 850 watt cooler master HAF-X logitech m705 logitech G930 
CPUMotherboardGraphicsGraphics
Intel I7 3970X MSI Big Bang-XPower II LGA 2011 Intel X79  MSI R7970 TF 3GD5/OC BE Radeon HD 7970  MSI R7970 TF 3GD5/OC BE Radeon HD 7970  
CoolingMonitorMonitorMonitor
custom water cooling from various manufacturers HP 2011x HP 2011x HP 2011x 
PowerCase
PC Power & Cooling MK III 750 BitFenix Colossus Venom 
  hide details  
Reply
post #3 of 3
Thread Starter 
Thanks, I will try when I get home. Hopefully that does it!
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