HELP MAC OS doesnt boot up SOS

Hello,
I have a serious problem with my Macbook from 2007: I get a folder sign wi a questikn mark when I want to boot up and the system doesn't start. I already tried to use every command while booting up including the single user mode but it doesn't work. I dont have access to my system cd at the moment because I'm travelling.
Is there any other way to get a system cd to come into the repair mode?
Many thanks in advance
Tobias

Based on your profile, I have to wonder if you attempted to upgrade yesterday and failed because of some underlying system issue. Rule#1 never upgrade during travel without a couple pocket drives to backup to.
That said you can try single user mode with command-s at startup, where command key has the Apple logo or a 4 leaved clover icon. Upon entering at the command line type
/sbin/fsck -fy
and hit enter. repeat until it says it can't repair, or repair is finished
if repair is finished type
/sbin/mount -uw
and hit enter. Then type
exit
followed by enter key.
If the repair is unable to be done, you need to recover your data, to an
external drive if not backed up using one of the data recovery tools here*
http://www.macmaps.com/backup.html#RECOVER
then try Alsoft Disk Warrior to repair the drive.
If that doesn't work, replace the hard drive.
- * links to my pages may give me compensation.

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