[CentOS] Radeon 9000 breaks with CentOS 4.4

Dell Inspiron 600M w/ Radeon 9000 card.  This worked with CentOS 4.3, also 
works with Knoppix 4.0.2.  Graphical installation succeeds, but upon 
reboot, and all subsequent rebbots, graphical mode does not work, the 
screen becomes black.  In addition to the 2.6.9-42 kernel, we have also 
tried the 2.6.9-42.0.2 kernel.  Same problem exists on both kernel. 
Running system-config-display --reconfig exits with the error "fatal IO 
error 104" Connection reset by peer.

Any ideas would be greatly appreciated.

Thanks,
Barry