Hangs on bootup unless monitor plugged in

[Richard Barraclough <richard@sigma.ndo.co.uk>]

Hi,

I'm running Debian 2.2.19 on a PowerMac 7200/90 which boots using Penguin.
If I start up without a monitor plugged in the machine hangs when the MacOS
disappears and Linux takes over.

I noticed that when MacOS disappears the screen goes black with some white
marks on, and then the usual Linux screen with the Penguin at the top
appears. I think the freeze occurs when this intermediate screen appears.

Any ideas?
Thanks.

-- 
Richard Barraclough
richard@sigma.ndo.co.uk
(PGP public key available on request)