Hi James, It tooks me more than a week to fine tune my new FC5_64 box. Now I can use onboard LAN, onboard sound and adding a PCI-E card without suffering from PC hanging. > DSDTs are part of the BIOS interface to ACPI (Advanced Configuration > and > Power Interface). BIOS ACPI implementations are notoriously buggy, > and > can easily crash kernels. So you may need to turn that off (noacpi -- > you'll lose hardware power-off). Poweroff without PC power-off is one of the remaining problem on this FC5_64 box. The cause is adding "noacpi" on kernel option at boot. Without adding it PC will hang frequently. I don't know whether upgrade BIOS will be its solution. OR there is other remedy. Any suggestion? TIA B.R. SL