My screensaver seems to be freezing and I can't access Safari. I've tried restarting/shutting down and that doesn't work. Any ideas to help?

My screensaver seems to be freezing and I can't access Safari. I've tried restarting/shutting down and that doesn't work. Any ideas to help?
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Which OS X is installed on your Mac ?
Click the Apple () menu top left in your screen. From the drop down menu click About This Mac. The version is noted there.
Troubleshooting advice can depend on that information.