I m using CentOS Distro after logging-in in command prompt i used "$ startx" to start my X-windows the X worked properly. Then i went to Command prompt again by CTRL+ALT+F1 and then when i attempted to go back to X CTRL+ALT+F7 the screen got black and nothing appeared I tried to kill the server but finally i gave up and restarted the system. Pls help me to fix this problem.

