[CentOS] MOUSE problem in Centos 5.1

HI All,
		
		i installed Cent OS 5.1 on a INtel P4 PC.
it got installed successfully. Upto the login prompt the mouse cursor
appears on the screen. then cursor disappers. i we move the mouse. the
cursor movement is felt when it is on a icon or when right click is done
but the cursor is transparent. i dont know what is the problem.

the mouse cursor is seen on the CUI prompt but not in GUI. Please help
me what to do.

the mouse is of Logitech make and is a ball mouse

Regards,
Gopinath