Xen Crash at Boot on Dell PE 830 Running FC 5

[cross posted to xen-users@xxxxxxxxxxxxxxxxxxx]

Greetings,

I'm having some trouble getting my new workstation, a
Dell PE 830, up and running Xen on Fedora Core 5.   The last step I see
in the boot process is udev which completes with the standard [OK],
then my monitor turns blank and looses any signal from my machine.  If
necessary, I could connect a serial port to get additional info on
exactly where it is crashing.

I'm using this machine as my desktop so I'd like to run X in
the dom0 if possible. Please let me know if doing so is considered poor
form with Xen.

I've gone through the install process on an older
Dell workstation successfully following the Fedora Xen Quickstart FC 5
guide here:

http://fedoraproject.org/wiki/FedoraXenQuickstartFC5

The
only way I've been able to work around this issue is to edit my
/etc/inittab and set the default run level to 3 in which case the
machine comes up clean.

I've verified that selinux is disabled as I've seen some info
to the effect that selinux and the nvidia drivers may have some issue.

I'm
hoping I can pass some argument at boot time to make this work or
otherwise tweak something in the bios to get the xen kernel to boot and
support X.

Thanks in advance for any hints or tips.

Here's the output of /proc/cpuinfo:

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      : Intel(R) Pentium(R) 4 CPU 
2.80GHz
stepping        : 9
cpu MHz         : 2800.198
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags
          : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
constant_tsc pni monitor ds_cpl cid cx16 xtpr lahf_lm
bogomips        : 5606.72

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 15
model           : 4
model name      : Intel(R) Pentium(R) 4 CPU 
2.80GHz
stepping        : 9
cpu MHz         : 2800.198
cache size      : 1024 KB
physical id     : 0
siblings        : 2
core id         : 0
cpu cores       : 1
fdiv_bug        : no
hlt_bug         : no
f00f_bug        : no
coma_bug        : no
fpu             : yes
fpu_exception   : yes
cpuid level     : 5
wp              : yes
flags
          : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm
constant_tsc pni monitor ds_cpl cid cx16 xtpr lahf_lm
bogomips        : 5600.31


And my grub.conf:

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol01
#          initrd /initrd-version.img
#boot=/dev/sda
default=1
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Fedora Core (2.6.16-1.2080_FC5xen0)
       root (hd0,0)
       kernel /xen.gz- 2.6.16-1.2080_FC5
       module /vmlinuz-2.6.16-1.2080_FC5xen0 ro root=/dev/VolGroup00/LogVol01 rhgb quiet
       module /initrd-2.6.16-1.2080_FC5xen0.img
title Fedora Core (2.6.15-1.2054_FC5smp)

        root (hd0,0)
        kernel /vmlinuz-2.6.15-1.2054_FC5smp ro root=/dev/VolGroup00/LogVol01 rhgb quiet
        initrd /initrd-2.6.15-1.2054_FC5smp.img