I'm running 2.4.2 i686 SMP, and I get a consistent (weird) hang at about 10 minutes of inactivity (right after the screen blank?). Monitor indicates video card producing a signal, but no key/mouse activity awakens system. Caps lock etc don't function, neither does Magic SysRq. Requires hard reset. I thought it might be APM or ACPI, so I disabled them, but the problem persists. I can give you a .config if necessary, but don't want to post here, obviously. Any ideas? Scott