One of my Mother Boards will accept either type of PS
also...  BUT, they used to have a jumper to tell the MB what
type to use.  Then they revised it and it will auto detect  in my revision...
Are you sure your MB can notice or has been told of the change?
                             Rick Glazier

----- Original Message -----
From: "John Hilton" <[log in to unmask]>
> I have just recently changed the 200W AT power supply in my computer for a
> 230W ATX (the motherboard supports both types) It is behaving strangely
> though, pushing the power button doesn't turn it on unless the power supply
> has been running in that last few minutes. The signal reaching the power
> supply from the motherboard to turn it on seems to be correct & I can turn
> it on manually by shorting the power on pin to ground, which starts the PSU,
> and then pressing the on button to start the cpu (the short is then
> removed). After running a little it can be turned off and on the normal way
> quite successfully.
> Is there anything that can be done other than replacing the PSU?

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