The screen goes black instead of turnin off

I have my screen set up to switch off after X minutes, and it is working fine, except it does not really shut downs. It just goes black, but the backlight is still working, while what I want is the result I get when I run
sleep 2 && xset dpms force off
I am using XFCE, xscreensaver and nvidia drivers.

Have exactly the same problem with my wife's MacBook Air. After restaring in Restore mode and trying to repair the disk (Disk Utility showed errors in the verification), the system tells me to backup as much data as possible (how?), re-format the disk and restore backed-up files. Error comes up when "updating boot support partitions for the volume as required".
Original restart action was done due to software update requesting it, if I remember correctly, iTunes was updated.
I don't want to start a painful back-up procedure (although I do regular back-ups): how should I know, where iPhoto stores it's data or where my mails are (yes, still using local mail)? How can I access the data if I can't boot?
My iMac's disk crashed also a couple of months ago and I'm still recovering. I have four Apple devices, two of them have failed. Can Apple afford such a ratio?

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