why the pc stop after a few seconds

[bb202]

This morning I was able to use is HP desktop andI shut down through the
normal process.This evening, when I power up the pc by press the button, the
power will come on for a few seconds and die down Why is that? Repeated the
start up and its still the same, power will come on foir a few seconds and
die down.

To eliminate physical causes, I open the box and disconnect all the
electrical connections and "short" the start up and it was able to go to
deskop. I was able to use it as usual. So, it seems there is nothing wrong
with the mobo but is there a tweak on the mobo for this kind of behaviour? Is
there a problem with the button??? Any ideas as how can I go aand use the pc
as per normal. Thanks.

 

[peter]

Off hand I'd say your power button on the case is shot.
if you have a reset button you can connect that to the power connection
on the mobo and use it like a power on/off switch.

If you push and hold the power button will the machine boot??
peter

 

[John Wunderlich]

This morning I was able to use is HP desktop andI shut down
through the normal process.This evening, when I power up the pc by
press the button, the power will come on for a few seconds and die
down Why is that? Repeated the start up and its still the same,
power will come on foir a few seconds and die down.

To eliminate physical causes, I open the box and disconnect all
the electrical connections and "short" the start up and it was
able to go to deskop. I was able to use it as usual. So, it seems
there is nothing wrong with the mobo but is there a tweak on the
mobo for this kind of behaviour? Is there a problem with the
button??? Any ideas as how can I go aand use the pc as per
normal. Thanks.

My guess is that your power supply is failing. When you disconnect
everything else, that lightens up the load on the power supply just
enough to keep it going. Power supplies have crowbar circuitry to shut
them down if their output is out of spec in order to protect the
electronics. I suppose it's also possible that one of your external
connections is feeding back voltage into the unit and tripping the
crowbar.

HTH,
John

 

[Jose]

Off hand I'd say your power button on the case is shot.
if you have a reset button you can connect that to the power connection
on the mobo and use it like a power on/off switch.

If you push and hold the power button will the machine boot??
peter

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I have seen the power button behave like this on some desktops too.

As a matter of fact I have one.

I have perfected the special light touch it needs to make it behave.
Push it in too hard... arrg! I have to pry it back out with a sharp
pointy instrument until it clicks back out.

It has advantages, though - nobody else can power up my machine but
me.

 

[bb202]

Also tried and change a new 460 True power supply, Coolermaster, but its the
same unable to boot up.If I hold on to the button, it also cut the power off,
that is to say it lights up for a few seconds, then off.

The front panel connections is all fused into s "stud" and in fact if I read
the words/connection correctly, the original connection is connected to the
reset switch and there is no wire to the power switch. (am quite sure I
interpret correctly).
Will try to see if anything get stuck at the switch button, have to open
the delicate front casing.

Many thanks for the ideas and will try, owise its useless this pc... thansk
for HP///