Alrighty. I'm having a hell of a time and I need help. I'll try to give as much information as possible. ---------- HARDWARE ---------- MB: Supermicro PDSBM-LN2+ Intel 946GZ ICH7R + Intel® 82573 Memory: Crucial 512Mb, 1Gb, 2Gb modules matched to above MB. Processors: Intel Celeron 420 Conroe-L, 1.6GHz 512KB 64-bit Intel Core 2 Duo E6320, 1.86Ghz 4Mb 64-bit Intel Pentium E2140 Allendale (Dual Core), 1.6GHz 1M 64-bit Hard Disks: Various Western Digital and Seagate SATA Drives ---------- ---------- BIOS (Rev 1.0 as well as Rev 1.0a) ---------- Disabled Native Mode Disabled Native Mode with ACPI Enabled SATA Native Mode ---------- KERNEL PARAMS (singularly and combination) ---------- acpi=off, pci=nommconf, pci=bios, nohz=off, noapic, nolapic, pci=routeirq, maxcpus=1 ---------- ATA_PIIX loads at startup, sometimes ACPI depending on my BIOS settings. Always after verifying dependencies, and typically during the disk format process, the installation freezes. I get a "kernel panic - not syncing" in text mode. Single disks, dual disks, LVM, no-LVM, software RAID, even when disks are on a Promise SATA300-TX4. The single-core Celeron processors work fine, but none of the dual core processors work. I'm using 5 sets of hardware, so bad hardware is unlikely. I'm stumped. Anyone out there with similar problems and/or workarounds? Any ideas? -Ken