Xwindow not working.

It now can’t to start Xwindows on Linux Redhat 8.0. By after off eletrical and my computer is turn off. And I had turn on my computer and meet it can’t start Xwindows. I don’t know who just what doing. Please who advice to me about resolve problem.

Thank you very much.
Phanlop C.
chut@ego.co.th