I am having 2 Nvidia Tesla K20 C in one of my workstation, when i run the nvidia-smi or device query it is giving the result. But when i run any of the sample programs that are present in the NVIDIA_CUDA-6.5_Samples/0_Simple, which are obtained after the installation of the CUDA tool kit is nor giving the output.
So then i re installed the CUDA tool kit but still no use, later i reinstalled the OS (Linux) also but still the same. Later i removed 1 card each time and still the issue is not solved. Can any one please look in to this.