[CentOS] CentOS5.5 cannot boot

[cjzjm100]

I hava not CentOS's CD,but i had made a live-usb of debian5,when i entered its rescue mode ,i found it need a CD,then i entered a shell ,but i cannot find the fs,i donnot know how i can mount the fs,because it hadnot mount command,any idea?
I find CentOS had some problem:sometime there is a fs error,all icons cannot load ,then i tried log in the shell,it said there was fs error,however i rebooted the system ,everything was ok!
In all those problem,i had not do any bad thing to the system.
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