After install of 10.9.2 have problems with rebooting

I have had to reinstall 10.9.2 and won't dare reboot because:
After install of 10.9.2 I reboot and got some kind of error that would not let me get to the logon screen. I'm not sure exactly where the hang up occurs but the output looks something similar to when booting with opt-S. The only thing I remember are words "osx version not set." The only way I could get things working again was to do a fresh install.
The second error occured after installing wireless mouse software that required a reboot. This time I could get to the logon screen but my keyboard no longer worked. In other words, there was a prompt for username and password but no keypresses were being registered. Once again the only thing I knew of to do was to reinstall.
Is there anything I can do to be able to tell if there is some latent problem waiting to happen if I try and reboot? Or should I just keep the machine on all the time now?
Thank you

Go step by step and test.
1. Power cycle
     Power off the router. Unplug it from the wall. Wait a while.
     Plug it back to the wall. Power the router on. Wait until all the lights are lit properly.
     It will take a   while.
     Restart the computer.
     Start up in Safe Mode
     http://support.apple.com/kb/PH11212
2 Empty Caches
    Safari > Preference > Advanced
    Checkmark the box for "Show Develop menu in menu bar".
    Develop menu will appear in the Safari menu bar.
    Click Develop and select "Empty Caches" from the dropdown.
3. Reset Safari.
    Click Safari in the menu bar.
    From the drop down select "Reset Safari".
      Click "Reset".
4. Safari > Preferences > Privacy > Cookies and all other website data:
     Press “Remove All Website Data” button
5. Turn off Extensions if any, and launch Safari.
    Safari > Preferences > Extensions

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After install of 10.9.2 have problems with rebooting

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