New Kernel Image

[Ernest]

New Kernel image 2.6.15-1.1830_FC4
is causing problems with gdm.

After boot:
the kernel is running, but gdm has crashed at the point where a user
login screen should appear.
All that appears is a blue background speckled with white dots. It might
be that gdm has not crashed, but the boot process has left something in
an incompatible state. 

It is possible to login to this machine, from another desktop, using
ssh. Once logged onto the fedora system and issuing the command
"gdm-restart", the gdm user login screen appears on the fedora system
console. 

What has changed between 2.6.15-1.1830_FC4
and 2.6.14-1.1656.FC4?  

Where do I start?
What information is needed?

System is an older Gateway PIII, 384MB RAM, ATI Radeon graphics card in
the AGP slot. 
X.org detects and configures this video card properly. The earlier
kernel worked fine, until the system was booted with  kernel 2.6.15-1.
Now kernel 2.6.14-1 exhibits the same problem. 


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