Problems with autoboot on powerup...

[Antonio Torres]

On Sat, 18 Dec 2004 18:11:31 +0300
"Alexander Vasenin aka BlackSir" <blacksir at number.ru> wrote:

> Hi! Month ago on some Russian forums I've seen a conversation about how to
> workaround if a motherboard BIOS doesn't have "Bootup after power fail" or
> similar option. The solution was to attach one wire of ATX power cord to
> ground(or maybe to +5V). I think if you make some google you'll find the proper
> wire and scheme of attachment. (My internal voice tell me that was a grey wire,
> but I'm not sure)
> 
> Alexander Vasenin aka BlackSir
> 
> > Greetings.  I was just hoping that someone has had experience getting
> > the PCChips motherboards to boot on lan, or boot with power.  The bios
> > does not have the same nifty options like the old days, where it has an
> > option for keeping the state just before losing power.  I have noticed
> > this on alot of new bioses.  They don't allow you to tell the
> > motherboard to autoboot, when power if applied.
> 
>...

You can put a small capacitor on terminals of the "power switch".

The Power supply will "think" You pressed the power switch exactly after the AC Power comes up.

The capacitor may be about 1 uF to 10 uF, depends on Power Supply; You need some tests..

Of course, You need some hardware knowledge, specialy to *do not invert polarity of capacitor*. (with reverse polarity, some capacitors, will work for a while, but fails in 2 or 3 months...)


Antonio Torres
antonio.torres at newspace.net.br