FC 6 on Powermac G5 Quad: Problem with headless booting

[Sascha Frey]

Hello,

I just installed FC 6 on my Quad core Powermac G5. Because this box is 
used as a server, I don't want to have a display connected to it.

With display, the systems runs fine, but without, it does not boot properly.
I'm unable to connect to it via SSH. Ping requests are answered 
sporadically.

I don't know how to track down this problem. There is nothing about this 
failed boot in /var/log/messages and the Powermac has no serial port, 
which can be used as a serial console.

What may I do to get this machine booting headless?



Thank you,

Sascha