[CentOS] Boot failure after install on IBM x3550 M3

I'm trying to install CentOS 5.5 on a couple of servers of type IBM 
System x3550 M3, but it's not going too well. Actually, the install 
setup phase runs as expected, and the actual installation also appears 
to be successful, but the system will not boot - I just get a message 
(presumably) from BIOS saying that boot from hard disk 0. If I start the 
installer again after this, or boot rescue mode off the install DVD, the 
installation is correctly found, however.

Does anyone have any idea what may cause this and/or how I can fix the 
problem? Or is there at least anyone out there who has tried CentOS on 
the same type of hardware?

Note that I've tried (re)installing several times, and also tested 
CentOS 5.4, but the result is always the same. I've also used CentOS 
without any problems on an x3550 M2, i.e. a slightly older variant of 
the hardware. I've (so far) installed with the default disk layout and 
package selection.

- Toralf



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