I've got a 5850 and noticed the same problem upon booting the 10.04 AMD64 
install CD.  I booted with two monitors connected via DVI ports and saw the 
blank screen issue.  I booted with a single HDMI connection and saw the same 
blank screen issue.  I booted with a single DVI connection and was X worked 
fine for me.  I was able to complete an install.  
Hope that helps someone, if there is any more information I can provide I'd be 
happy to do so if it will help.

thanks,
Andy

-- 
[lucid] ATI hd5xxx cards wrongly doing kms?
https://bugs.launchpad.net/bugs/560306
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