2.71, Cycles, choosing CPU/GPU is unavailable

Now, that’s weird: installed 2.71 instead of 2.70, and now there is no way to choose between CPU and GPU when rendering with Cycles. No idea why, it was there with 2.70 and worked okay. So it’s very improbable that the problem is with hardware. Now there’s “open shading language” option only. Any kind suggestions what might be wrong? Screenshot is below:

UPD: Kind people helped to sort it out.

See reply.

Thanks to another users forum, the problem is sorted. It appears that one must first go to User Preferences -> System -> Compute Device and switch from CPU to CUDA.

Then Render-> Device option becomes available again.