Recently, I encountered a strange problem of invisible mouse cursor after a fresh install of RHEL 5 on my desktop. Invisible in the sense, that I could still use the mouse to click on icons if I managed to place the "invisible" cursor correctly on the icon. I tried to search for answers by "googling" and after following a few links, I finally got the desired link which helped me resolve this problem.
Following the steps given on this blog post on devhen.wordpress.com, I was able to get the invisible mouse cursor to become visible again.
The trick is to edit your /etc/X11/xorg.conf file by adding this line Option "HWCursor" "off" to your videocard device section such that it looks like the following:
Section "Device" Identifier "Videocard0" Driver "nv" Option "HWCursor" "off" EndSection