Drivers Error

Did you "clean" the old drivers before installing new drivers? This is especially important if you previous GPU was a Nvidia card. Try resetting the GPU. If available try the GPU in another PC to make sure the card works fine.
 
The 7950 should use the same driver as the R9 270x= both are AMD cards - so you should not be having any issues with drivers - unless by uninstalling /installing they got messed up. Do you have catalyst fully installed thru the AMD website? - does it recognize the GPU ? Also - try putting the R9 back in the PC - to make sure there isn't anything else wrong. If you put the R9 back in and the system works - then you have to look at the 7950 being the problem. Did you buy the 7950 used?
 
OK - so you have 2 x 7950's and you are replacing a R9 270x with them? You never answered if they were purchased used or not. It makes more sense now- wondering why you were ditching the R9 270X for a 7950 - it isn't that much better of a card- but if your planning on Crossfiring 2 of them - then they would kick butt.

OK - Situation #1 = One works fine when put in alone. But when you took it out and then put the second one in - it failed = situation #1.

Situation #2 = put one in and it works and then when you place the second one in (so now have 2 7950's in the PC ) they both failed to work even though you did not put a crossfire bridge between the 2 7950's= situation #2.

#1) the second 7950 is a problem with either not being put in correctly ( check to make sure it is fully into the PCI slot or it is not getting power correctly (check the power connections) . If catalyst recognized the first 7950 then it is not a driver issue. It is possible this GPU is bad and needs to be returned/replaced.

#2) if you have both 7950's in the PC at the same time without a crossfire bridge - i am not sure they are even supposed to work without the bridge = beyond my knowledge. Are you trying to crossfire them - is that the plan ? Do you have a good enough PSU to power both 7950's properly and a MOBO that supports crossfire?
 
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