Thanks for the suggestion.

Contents of /var/cache/akmods/akmods.log
START
2015/07/25 16:06:18 akmods: Checking kmods exist for 4.0.8-200.fc21.x86_64
2015/07/25 16:06:18 akmods: Building and installing nvidia-340xx-kmod
2015/07/25 16:06:18 akmods: Building RPM using the command '/bin/akmodsbuild --target x86_64 --kernels 4.0.8-200.fc21.x86_64 /usr/src/akmods/nvidia-340xx-kmod.latest'
2015/07/25 16:07:03 akmods: Installing newly built rpms
2015/07/25 16:07:03 akmods: DNF detected
2015/07/25 16:07:20 akmods: Successful.
2015/07/25 17:22:20 akmods: Checking kmods exist for 4.0.8-300.fc22.x86_64
2015/07/25 17:22:20 akmods: Building and installing nvidia-340xx-kmod
2015/07/25 17:22:20 akmods: Building RPM using the command '/bin/akmodsbuild --target x86_64 --kernels 4.0.8-300.fc22.x86_64 /usr/src/akmods/nvidia-340xx-kmod.latest'
2015/07/25 18:07:53 akmods: Checking kmods exist for 4.0.8-300.fc22.x86_64
2015/07/25 18:07:53 akmods: Building and installing nvidia-340xx-kmod
2015/07/25 18:07:54 akmods: Building RPM using the command '/bin/akmodsbuild --target x86_64 --kernels 4.0.8-300.fc22.x86_64 /usr/src/akmods/nvidia-340xx-kmod.latest'
2015/07/26 14:05:01 akmods: Checking kmods exist for 4.0.8-300.fc22.x86_64
2015/07/26 14:05:01 akmods: Building and installing nvidia-340xx-kmod
2015/07/26 14:05:01 akmods: Building RPM using the command '/bin/akmodsbuild --target x86_64 --kernels 4.0.8-300.fc22.x86_64 /usr/src/akmods/nvidia-340xx-kmod.latest'
2015/07/26 14:05:47 akmods: Installing newly built rpms
2015/07/26 14:05:47 akmods: DNF detected
2015/07/26 14:06:00 akmods: Successful.
END

ran:
 /usr/sbin/akmods --force

and now the file has the additional line:
2015/07/27 14:54:21 akmods: Checking kmods exist for 4.0.8-300.fc22.x86_64

Still no mouse or keyboard.


Thanks
Richard