I have just replaced my PC Motherboard because my old one was self booting
upon switch on. Even with no wires attached at all with the exception of the
main power cables it switched on when power was applied.
Now I find that my new motherboard is doing exactly the same thing.
Could it be that the power supply has a fault which causes it to do
I feel I have spent money for nothing.
I refer you to my previous answer. If no wires are attached, then the
reset switch or the power switch cannot be the problem.
The "problem" must be on the motherboard. It could be a misplaced jumper
but the odds are that it is just a bios setting.
Erm, that was rather the problem that he was having...
The ATX power switch is very far removed from the "big red switch" of old.
The power supply contains an auxiliary supply that is always on, when
the mains input is present.
If the BIOS is set to automatic boot on power restore, motherboard
circuitry will detect the presence of the auxiliary supply and send a
start signal to the main supply - much in the same way that the "power
Sue, I would like to thank you and all the other contributors who replied to
my thread. Sue, you were the first to get the problem solved for me. The
board in both cases was an ASUS and both have Phoenix Bios on. Both boards
did have the Bios set incorrectly and as soon as it was altered, both boards
I never usually play around with Bios settings for fear of upsetting
something that I know nothing about but will remember this saga for the rest
of my life.
YVW. But there is nothing special in my suggestion arriving first.
People respond as and when they read the post and the way news messages
disseminate means that many can be answering "first", as far as they
know. The main thing is that people are willing to stick their neck out
and try to help.
Glad you have it sorted.
Erm, not always. It is possible, with some settings on some (usually the
more expensive) motherboards to make alterations that cause permanent
irreperable damge to the mobo/processor/memory.
Worse (?) on some (particularly laptops) even setting a password is
irreversible*, if you forget it.. * other than at a workshop.
There is also the rather more amusing thing to do - set a password using
a foreign (eg French) keyboard and then take it elsewhere to use, where
the keyboard is different (eg Russian)....
None needed. I got it wrong too and misread the post, thinking that the
OP had changed the power supply. I hadn't even considered that he might
have changed the mobo. Luckily, it didn't affect the solution to the
Posters get a mental image of what the situation is, from the post.
Sometimes it's right. Sometimes it's wrong. Sometimes it's very wrong.
No one should get criticised for giving the best answer they can based
on their mental image. We need people that will stick their neck out and
venture their thoughts. Next time, it could be my turn to have totally
the wrong end of the stick..
Yes, it will. And obviously is. The power switch is not connected via
the main 20/24 pin connector, is it? And that's all he has connected.
There is no difference between "power switch not connected" and "power
switch not pushed" as long as the switch is not stuck. It's a momentary
However, as previously stated, a BIOS setting that says "start when
power applied" or "revert to previous on/off state" (the latter assuming
a previous state of "on") will not even *look* at the power switch
state; it'll just turn the system on.
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