>> 7.024044] i2c i2c-0: nForce2 SMBus adapter at 0x600 AMD's Socket A. Pretty old, slow system. It's possible it doesn't implement APIC and ACPI correctly. Someone suggested a bios update - if there is one, that would be a good idea. Does the command 'smartctl -a /dev/sda' show any reallocated sectors?