Here is a redhat bugzilla entry about this problem: https://bugzilla.redhat.com/show_bug.cgi?id=239931 Roelof van der Kleij wrote: > 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