you DO realize that 5.0 is VERY old, older than your laptop. RHEL5.0 might NOT support your hardware .
Why are you using rhel5.0 and not the current RHEL5.6 or RHEL 6.1 ?
6.1 might support your laptop .
Keep in mind that RHEL was NEVER intended to be ran on laptops
so support for some of the laptop hardware might not work .
sound may or may not work
the mouse pad may or may not work
the 3d chip may or may not work - if not then NO gui .