HT204452 My Mac is blinking all the time after the latest update.

The computer was working fine before the update. Now, it blinks the active screen when I try to load anything. I can't use my softwares or browse on network. Somebody with this issue?

Back up all data before proceeding.
Launch the Font Book application and validate all fonts. You must select the fonts in order to validate them. See the built-in help and this support article for instructions. If Font Book finds any issues, resolve them.
Start up in safe mode to rebuild the font caches. Restart as usual and test.
Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t start in safe mode. In that case, ask for instructions.
If you still have problems, then from the Font Book menu bar, select
          File ▹ Restore Standard Fonts...
You'll be prompted to confirm, and then to enter your administrator login password.
Also note that if you deactivate or remove any built-in fonts, for instance by using a third-party font manager, the system may become unstable.
From the Safari menu bar, select
          Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data...
and confirm. Close the window. Then select
           ▹ System Preferences… ▹ Flash Player ▹ Advanced
and click Delete All. Close the preference pane.

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              MacBook - model: MacBook7,1
              1 2.4 GHz Intel Core 2 Duo CPU: 2 cores
              2 GB RAM
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