I just installed a 4.5 machine and it hangs when booting at "grub 
loading stage 2".  Here's the strange part.  It hangs only when a SCSI 
disk (LVD/SE) disk is attached.  SCSI card is an Adaptec 29160.  When 
the  disk is removed, it rips right through the boot.  The disk is fine 
because I use the 4.5 install disk in rescue mode and I can see the 
disk, mount it, and all its data is there.  I tried with another disk 
and I have the exact same result.  I'm baffled!!

Ken