I have the same problem (with a ATI Radeon 9200 Pro) on my Ubuntu "8.10", then 
"9.04" : 
"on a fair percentage of boots (around 40-50%), the machine appears to hang 
with a black screen immediately after the splash screen progress bar fills up".

On Ubuntu "9.04", sometimes, the screen is not black but contains
pseudo-random datas (I can recognize the wallpaper of precedent boot).

An interesting point is that the problem appear since we change the kernel 
"2.6.24-23".
In fact, the problem totally disappear every time I boot with the old kernel 
"2.6.24-23".

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Ubuntu 9.04 gives black screen after splash, remote login shows hung/unkillable 
gdm instance
https://bugs.launchpad.net/bugs/370111
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