-=PCTechTalk=- Re: Start Problem?

  • From: Gman <gman.pctt@xxxxxxxxx>
  • To: <pctechtalk@xxxxxxxxxxxxx>
  • Date: Tue, 3 Jun 2008 18:26:34 -0400

Wow, lots of questions here, DJ.  See below for my replies.      :O)


"The only dumb questions are the ones that are never asked"

----- Original Message ----- 
From: "cajun12" <cajun12@xxxxxxx>
To: <pctechtalk@xxxxxxxxxxxxx>
Sent: Tuesday, June 03, 2008 5:03 PM
Subject: -=PCTechTalk=- Start Problem?

> Thanks, G-Man.  I have been suspecting the MB for the past two days.  =
> Since I just transferred my entire system to a brand new case, I'm =
> seriously doubting that the switch itself in two cases is the problem.  =
> I've also reseated the power switch several times.  My board does not =
> have an LED that I've seen.  Today I pressed the Start button on my new =
> case 20 times before it came on.  As you state, once the system starts, =
> there are no instabilities.  I have pulled and reseated both the 4-pin =
> 12volt psu connector and the 24 pin connector several times. =20
> You're saying that the MB is the only other suspect.  Would a problem =
> with the CPU alone cause any of these symptoms? =20

The CPU is not involved with the power on signal sent back to the power 
supply, so your mainchip is not the culprit here.

> Since it does power on sometimes when the switch is pressed, would I =
> have to perform the exercise of touching the bare MB connectors with a =
> flat head screwdriver multiple times to see if it comes on each and =
> every time?  My power switch pins are right up against the message light =
> pins.

I would try it at least a couple of times to make sure it works (or doesn't) 
more than once in a row.  To safeguard the other pins, slide a piece of 
paper around the two power on pins to isolate them.  Construction paper or a 
piece of a paper bag (sack) works really well for this.  Remember, if it 
comes to life consistently, it's not the board.  If it still exibits the 
same behavior, it's probably the board.

However, I had another thought that I want to add to this.  The Power On 
signal (tech term: 'PS_On') is made possible by a special +5 volt pin in the 
large 20 or 24 pin plug that goes formt hePS to the board.  This is a 
separate voltage that remains on even when everything else is powered down. 
If this special line is experiencing a problem, it is conceivable that you 
could also witness this behavior.  To test this, try the screwdriver idea 
above first.  If it takes a number of times to get the system to wake up, 
power back down and try it again.  This time, gently grasp the cable running 
from the PS to the board and reposition it before touching the pins 
together.  The idea is to see if there is a loose or partially broken wire 
within that cabling.  If it doesn't work in several positions, try grasping 
the cable near where it enters the PS and push it towards the PS.  You can 
also try this same technique on the other end (where it connects to the 
board), but be careful that the pressure you use isn't enough to cause the 
board to bend.

> Can this particular board issue cause any shortages to any peripherals =
> connected to it?  Should I tolerate my aggravation and just wait for it =
> to die a final death before replacing, or can it go on like this for =
> years?

Assuming it IS the PS_On circuit on the board, there is no danger to other 
devices, but it does not signal impending doom for the board.  It's just one 
small circuit that's having an issue, so the board itself should last just 
as long as it would without the problem.

> dj 

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