centOS block at longin plateform

This problem is environment error for me..
my export append ;$PATH ,which should be :$PATH

Following is solution:
press ctrl+alt+F3   switch to code mode
log in..

cd /bin
/usr/bin/vim /etc/profile

then modify your error configuration(maybe not /etc/profile,that you'd better look back upon your options relate environment)

ctrl+alt+esc back to graphic mode to restart..