run level 5 fails

<p>Hello friends, I am using RHEL5.1, Problem:After successful installation of Linux(graphic &amp; text) my system gets hang-up stage. but works well in run-level 3,and fails to load in run level 5. The real thing that happens is, after selecting from grub, system starts-up and loads all the services successfully then normally it should go for root log-in screen, instead of that mouse cursor displays at the center of the screen &amp; when i try to move the cursor it's moving with a delay of 15-20 seconds and system gets very slowly. I tried almost all that i know(init 5, startx).I also user different Cd's to install.</p> <p>Please help me out of these problem.</p>