We cannot know. You are not telling us anything about your Mac and this is pure speculation on your part. It's unlikely that your screen configuration is the problem. What error are you seeing exactly?
The message says that CS6 is not supported on this type of Mac.
Is this Hardware overview enough information?
Model Name: iMac
Model Identifier: iMac4,1
Processor Name: Intel Core Duo
Processor Speed: 2 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 2 MB
Memory: 2 GB
Bus Speed: 667 MHz
Boot ROM Version: IM41.0055.B08
SMC Version (system): 1.1f5
Serial Number (system): QP60802EU2S
Hardware UUID: 00000000-0000-1000-8000-0016CB8B72E7