No power after switch off main

Hi experts,

i got this very strange problem.
my motherboard is dvd266-r which i purchase from someone else.

after i setup everything, the motherboard detects my dual PIII 866 mhz cpu as dual PIII 433 mhz.
as such i modify the settings manually to make it dual PIII 866 mhz.

everything works fine except that everytime when i power off the main switch on the wall and switch it on again, the computer wouldn't be able to boot up again.
it is as though there is no power to the computer (fan not on, no led lights, etc).
to solve this, i had to either reset my cmos jumper or totally remove my cmos battery in order for it to be "able to receive power" and boot up.

The strange thing is that if i just power down my computer without switching off the main switch on the wall, everything would be fine. I would be able to press the power-on switch on my computer and boot it up as normal. Once i switch off the main switch on the wall and later power it on again, pressing the power-on switch on my computer will no longer work.

anyone encounter same problem before?
motherboard faulty?
LVL 1
help-meAsked:
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Chris BRetiredCommented:
Sounds like a flat battery.

Chris B
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help-meAuthor Commented:
i have actually change the cmos battery as well.
same problem.
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Chris BRetiredCommented:
OK. Just to clarify, does it revert to 433 after disconnecting power or stay at 866? Power supply may be reacting to perceived power failure. If it has a switch at the back, try switching this off and on with the power connected. See if it will start then.

Chris B
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help-meAuthor Commented:
hi Chris B,

it revert back to 433 after disconnecting power.
do you mean switch at the back of power supply??

thanks
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Chris BRetiredCommented:
Yes that switch. But if it is reverting to 433 the switch is not the problem. It is not remembering the bios setting, so either your new battery is dead, or not making contact. Battery should be installed with flat side up (usually) maybe check manual. Make sure that the battery socket is tight and making good contact. Good to check with multi meter.

Chris B
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help-meAuthor Commented:
the battery installation and socket should be ok too.
I think the reason that it reverts back to 433 is because i have reset the cmos.
I have to reset cmos in order to bring the computer up again.

thanks.
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Chris BRetiredCommented:
That would be right. Try the switch then.

CB
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help-meAuthor Commented:
there is no switch at the back of my power supply.
new updates:
(1) i have tried taking out the cmos battery and try.
while i would lose my cmos settings, the computer managed to bootup even if i switched off the main power supply.
(2) I have tried taking out everything on my motherboard .
the computer would be "able to receive power" if i took out all the processors out from the motherboard.
but i think it shouldn't be the processor problem as i have tried 3 different processors and the same problem occur.
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Chris BRetiredCommented:
<<there is no switch at the back of my power supply>> I just knew you were going to say that. Such is life. I am about out of ideas. It doesn't sound like the power supply. Will the board run with just one processor installed? Don't try it without checking the manual to see if it is OK.

Chris B
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help-meAuthor Commented:
the board can run with just one processor and i have tried that too.
same problem.

me too out of ideas.

thanks for helping.
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Chris BRetiredCommented:
Sorry couldn't sort it out. No need to waste your points though. You can post a zero point value question in Community Support asking for a refund.

Cheers

Chris B
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help-meAuthor Commented:
hi Chris B,

its ok for the points.
I feel that you have really tried to help giving very good suggestions, so i should really say thanks to you.

thank you. :-)
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