At 13:52 11/17/2005 -0800, Lan Barnes wrote: >My myth-box-to-be is full of silly challenges. When I turn it off (hold >the on/off down 4 seconds), it doesn't turn on.
Huh? This confuses me. Do you mean that: a) If the computer is turned off by using the power switch that you are unable to turn it on again with the power switch? or b) You are unable to turn the computer off using the power switch even if you hold the button for ~4 seconds. > The switch is a >momentary with two connection pairs, both labeled POWR SW. There are two >pin pairs with the same label on the MB. I've tried every possible >combination. The switch pair you want is the normally open set. >I turn power management off in the BIOS. > >I had success once when I took the power plug out until the LEDs on the >eth0 card died out, and then it started on the next push. > >I am guessing that the MB has some weird rule about accepting on/off >signals. > >Does anyone have any insight? Allen Bros? ATX power supplies use a digital control signal to turn them on/off, unlike the older AT power supplies where the switch actually turns on/off the AC power. The ATX power supply also provides a +5VDC standby power output even when it is in the "off" state. This is what allows the computer to do things like "wake-on-lan" and "wake-on-ring" because there is always power applied to the PCI bus for the ethernet card and modem card. This is also why you need to unplug the computer before you insert or yank out and cards. The control signal to the power supply is governed by the motherboard. I'm not aware of any BIOS settings that would prevent you from turning on the computer with the power switch. It's possible that you have a bad motherboard, especially considering that you say it works if you truely power it off by unplugging it and then reenergizing by plugging it back in. It's also possible that your power supply is starting to go bad and doesn't want to recognize the on/off signal. I have a spare power supply you can borrow if you want to test this hypothesis. Gus -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
