Model Name: Mac Pro
Model Identifier: MacPro4,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 2.26 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per core): 256 KB
L3 Cache (per processor): 8 MB
Memory: 6 GB
Processor Interconnect Speed: 5.86 GT/s
Boot ROM Version: MP41.0081.B07
SMC Version (system): 1.39f5
SMC Version (processor tray): 1.39f5
Sorry i am new to mac & communities , when you say repair the drives and clone the system what do you mean ?
Launch the Console application and select system.log. Post any error messages from the time of the last failed startup. If there are duplicates, please include only one example of each.
Also, try starting up in safe mode and see whether you have the same problem.