Some 64 bit kernel / bios combinations have problems with >= 4 Gb of
memory. If you have that, try it with only 2 Gb of memory installed. If
this is your problem, try playing with memory mapping bios settings.  In
my case, I ran into it with an Intel DQ965GFE motherboard after a bios
upgrade.

Roelof

Maccy wrote:
> I'm having some problems trying to get SL4.5 to run properly on an 
> Intel Core 2 Duo system with Intel DQ965GF mobo and 2 x SATA II disks. 
> The O/S installs fine but takes forever to boot up and run.
>
> I've tried adding a number of kernel parameters including 
> all-generic-ide, irqpoll, pci=nommconf, acpi-off and 
> selinux_compat_net=1. The Intel Quick Start Kit available for that 
> board reports that all necessary drivers are already installed. The 
> BIOS drive configuration is set to ATA/IDE=Native and SATA=AHCI. I've 
> experimented with other BIOS drive settings to no effect, and also 
> built a newer kernel (2.6.21) from source.
>
> Of course Scientific Linux 5.0 installs and runs without issue but as 
> all our other machines are 4.5 I'd like to get it going on this!
>
> Any advice appreciated,
>
> Mark