At the command prompt, type: startx
The CLI will output errors, if there are any, if not your GUI will startup.
If you get errors make a note of them and post back - you're sure to get some help.
BTW - Welcome to LQ!
EDIT You could also do a search for any errors you get - there are loads of threads here about X not starting - this might yeild a quicker answer to your question.
Last edited by pongmaster; 09-16-2004 at 07:53 PM.