Thomas,

Your message is a bit unclear. You installed/configured samba, and now
when you reboot your system hangs at mounting file systems in fstab?
Unless you modified fstab in some way these two are unrelated. What
are you trying to accomplish with samba? Why did you edit fstab?

What exactly is it you're trying to do? Automatically mount SMB share
on boot? If this is the case, did you test mounting the file system
before rebooting? If not, do that next time and resolve the issue
before you have an unbootable system. Once you do have things
resolved, keep in mind your system may hang if the remote server is
unavailable. Using autofs may work better, or your can throw a noauto
flag into your fstab for the SMB file system so that Linux doesn't try
to mount it automatically.

In the mean time, have you tried bringing up your system in single
user mode? Does that work or does the system still hang?

What distribution are you using?

-- 
Andrew S. Zbikowski | http://andy.zibnet.us
IT Outhouse Blog Thing | http://www.itouthouse.com