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User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)

Description of problem:
I've not been running fedora kernels for a while but today fired up 
the latest one in -devel (entire system is up to date with devel).  I 
usually run -mm and vanilla kernel.org kernels.

The system boots up normally, and all looks well, however 5-10 
seconds after the system reaches it's final runlevel 3 and the login 
prompt appears, it falls over and returns to the bios screen.

This problem had not occurred with any other kernel I have ever 
tried, including the vanilla 2.6.8.1 from kernel.org.

The box passed with 100% on memtest, on a 4 hour run.

It is an Intel P4-2.8, with HT enabled, on a Gigabyte 8IPE1000-Pro2 
board (intel 865 chipset).  I am running reiserfs on a raid1 set of 
disks.

I've booted up with  maxcpus=1  and noapic   and the problem remains.

Version-Release number of selected component (if applicable):
2.6.8-1.584

How reproducible:
Always

Steps to Reproduce:
1. Boot up box
    

Actual Results:  Box reboots without warning or logging anything 
in /var/log/messages

Expected Results:  Box ought to have been stable ;-)

Additional info:

Box has latest BIOS installed, kernel is not tainted.  I am not 
overclocking the system.