Dear All, Thank you very much for all your help with setting up my new SL4 machine. I have just one more minor problem: the following sequence of messages appears in the system logs every half hour. Jan 16 11:29:35 shanghai kernel: irq 217: nobody cared! (screaming interrupt?) Jan 16 11:29:35 shanghai kernel: irq 217: Please try booting with acpi=off and report a bug Jan 16 11:29:35 shanghai kernel: [<c0107532>] __report_bad_irq+0x3a/0x77 Jan 16 11:29:35 shanghai kernel: [<c01077a9>] note_interrupt+0xea/0x115 Jan 16 11:29:35 shanghai kernel: [<c0107a55>] do_IRQ+0x143/0x1ae Jan 16 11:29:35 shanghai kernel: [<c02d51a4>] common_interrupt+0x18/0x20 Jan 16 11:29:35 shanghai kernel: [<c01040e8>] mwait_idle+0x33/0x42 Jan 16 11:29:35 shanghai kernel: [<c01040a0>] cpu_idle+0x26/0x3b Jan 16 11:29:35 shanghai kernel: handlers: Jan 16 11:29:35 shanghai kernel: [<c0241ae2>] (ide_intr+0x0/0x11e) Jan 16 11:29:35 shanghai kernel: [<c025a6c0>] (usb_hcd_irq+0x0/0x4b) Jan 16 11:29:35 shanghai kernel: Disabling IRQ #217 This machine has an Intel D965SSCK Core 2 Duo 6300 2MB cache chipset, and I'll post the rest of the specs if you think they are relevant. Is the fix just to add acpi=off to the kernel options? Thanks again for all your help. Eva.