谁能告诉我这个引导错误是怎么回事

dragonchina

/proc: no mount ,mount fail
mount usb file system: execvp: no such file or directory
couldn't open /proc/partitions:no such file or directory
Is /proc mounted
An error occurred during the file system check
Dropping ou to a shell the system will reboot
when you leave the school

以上的提示信息个别不是连在一起的。
这个错误信息是由什么导致的，上次用还好好的，也没有改什么