Bad Cron
 

my friend...way smarter than me with linux gave me a cron job...every five minutes my cdrom ejects...i cant kill it!! help!

Well, what's the cron job?

What account did he do it from? Log into that account and type crontab -e,
there could be a line something like 5 * * * * eject /dev/hdc or something similar, if there is, erase it.