After 6 hours of running down- and upstairs between office and server-room I solved my problem of a red screen after booting a new HP ProLiant DL380 G7 server.
I installed Debian 5 (Lenny) a few days before to the HP SmartArray P410i.
First things first
The reason for all my problems: I used an USB-Stick during installation for getting additional Broadcom-Drivers from it.
The red screen occurs because GRUB isn’t found. The MBR of the RAID is just empty…
For any reason we get a red screen with some not documented error-codes instead of a „MBR not found“ or „System not found“ message
I successfully booted the machine a few times before the red screen appeared.
Now I know that it happened because I removed the USB-Stick this morning. Debian Lenny has a small bug: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=506263
If you use an USB-Stick during installation and if you start GRUB at the end it uses your USB-Stick as boot-device instead of your RAID-Controller.
How I solved the problem
After knowing the reason it wasn’t too hard to solve the problem ( follow at your own risk )
title Debian GNU/Linux, kernel 2.6.26-2-amd64 root (hd0,0) kernel /boot/vmlinuz-2.6.26-2-amd64 root=/dev/cciss/c0d0p1 ro quiet initrd /boot/initrd.img-2.6.26-2-amd64 title Debian GNU/Linux, kernel 2.6.26-2-amd64 (single-user mode) root (hd0,0) kernel /boot/vmlinuz-2.6.26-2-amd64 root=/dev/cciss/c0d0p1 ro single initrd /boot/initrd.img-2.6.26-2-amd64