On Fri, 3 Dec 2004 23:14:01 +0000, James Wilkinson <james@xxxxxxxxxxxxxxxxxxx> wrote: > Wong Kwok-hon wrote: > > I re-installed the Fedora Core 3 with acpi=off and apm=off at > > installation prompt. > > > > I typed :linux acpi=off apm=off when install but still failed to power > > off the machine with same symptom "power_off call" > > To the best of my knowledge, you need either (the appropriate parts of) > ACPI or APM enabled for this to work: soft power down was physically not > possible on standard PCs until the ATX standard was brought out, and > support for it was provided first with APM, then also with ACPI. > > James. Thanks James and my problem fixed after just used acpi=off. Ringo