Backspace + power keys freezes the computer

macbookair (2013) has near buttons backspace and power key, then I sometimes pres booth these keys together, then computer sleep and immediately (looks like) wake up but freezed.
in this state:
- keyboard backlight is ON
- display is OFF
- no response on keyboard or trakcpad
- if is connected external monitor, then it show only on external monitor last picture, but image is freezed
- it respons only on power button long press for restart the computer
this state is on my computer 100% repeatable.
when I press power button only, this is working normally.
thanks for any solution.

Did you recently upgrade to 10.4.8? Not sure of your OS version due to the multiple items listed at the bottom of your post.
There are two things you can quickly try:
move the com.apple.safari.plist file in your User Library>Preferences to the desktop and restart Safari. Does the crash stop? If not, move the file back to its original location, replacing the newly created Preference file. If it works, then you'll need to reset your Safari Preferences as well as View menu and Edit menu (spelling) selections you may have chosen.
Try Safari from another User Account. Does it crash? You can create another user account by going to System Preferences>Accounts. Apple directions are here..
Post back with results.

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