Install hang with debian-installer b4/tc1

[Darren <nospam@dledmonds.eclipse.co.uk>]

Hi,

I am trying to install debian sarge (with debian-installer) on a 1.4Ghz 
Athlon with a K7S5A motherboard, AHA-2940W SCSI controller, 4GB SCSI 
disk, 40GB IDE disk, network card and vga card.
I tried to use the boot cd for test candidate 1 and when it gets to 
detect hardware the monitor turns off and the machine is unresponsive.

I tried beta 4 boot disks, booted, loaded network modules, downloaded 
install files and on the partition screen there are no harddisks to 
choose from (I want the install on the IDE disk).

I tried beta 4 boot disks, booted, loaded cdrom drivers, then it tries 
to detect the network card and monitor switches off and the machine is 
unresponsive.

I though the SCSI disk could be causing problems, so I've tried booting 
with linux noscsi and linux aic7xxx=no_probe,no_reset but I get the same 
problems each time.  As the monitor dies I can't even do Alt-F3, Alt-F4 
to look at the install log.  Someone suggested removing non essential 
PCI cards and trying again (perhaps the SCSI controller?), but what else 
can I try?

Thanks,
Darren