I experiment the same problem.
I downloaded and burned the four CDs, check the MD5SUM IDs and check every CD to confirm that there is no problem whit this medias.
When I trie install FC2 everything goes well until second CD. The installation initialize a copy of files (install the RPMs) and simply reboots with no messages.
I started with rescue mode, but no messges are find in logs on /root.
Then, I install FC1, its working well. Next I proceed with Upgrading method of installation, everything goes well until "Preinstallation fase", then reboots again.
There is some place to find informations about kernel parameter ?
Thank's for any help.