[CentOS] unable to boot centos 5 on dell optiplex 320

Hello All.
I have a dell optiplex 320 that I can install centos5 on using pci=nomsi.  That seems
to be the only way.  After the install grub loads but thats about as far as it gets.
It looks like a BIOS bug to me, but I just don't know.  I left it sit for a few minutes
and it just had the echoed boot params on the screen.

I've tried booting with noapic nolapic apm=off acpi=off and noprobe but can't get
any farther than this.  Anyone know if this thing will boot?

Thanks
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