Noob question: Solving crash problems

[JumbledGrass]

I've set Overclock in xbian-config to "XBian".

For the SD card check, I've tried

Code:

sudo touch /forcefsck
sudo shutdown -r now

and

Code:

sudo shutdown -Fr now

but neither seems to be executing a file system check as both /var/log/checkfs and /var/log/checkroot are empty.