Bob Stia wrote:
> On Wednesday 22 July 2009 02:54:41 Paul Bransford wrote:
>> Bob Stia wrote:
>>> On Tuesday 21 July 2009 00:45:21 Paul Bransford wrote:
>>>> Bob Stia wrote:
>>>>> On Monday 20 July 2009 12:03:21 Eben King wrote:
>>>>>> On Sun, 19 Jul 2009, Bob Stia wrote:
>>>> The wattage of the power supply doesn't have anything to do with it
>>>> failing, these things can die after a time. Sure, loading it close to
>>>> (or overloading) it's capacity can shorten it's life, but that's not
>>>> what I'm after right now.
>>>> -----------------------------------------------------------------------
>>> OK Paul,
>>>
>>> I fully understand what you are saying, the power supply, although big
>>> enough, might be going bad.
>>>
>>> But you need to explain to me why the power supply could be causing this.
>>> The monitor(s) are completely self powered. The only input to the monitor
>>> is a small digital signal through the DVI cable. Don't really understand
>>> the relationship with the power supply. Learn me !!
>>>
>>> Bob S
>>>
>>> -----------------------------------------------------------------------
>> I don't think this has _anything_ to do with your monitor.
>>
>> It sounds like your motherboard is not sending your power supply the
>> PWR_GOOD signal unless you start it, shut it off, and start it again.
>>
>> The motherboard will not send that signal if it is not getting correct
>> voltages. It could be that your motherboard only checks this once during
>> post, meaning if the voltages have not stabilized yet, it will not fully
>> power on. Once the power supply has 'warmed up' and is sending the
>> correct voltages, it will 'pass' the self test, and the board will send
>> the PWR_GOOD signal. This tells the power supply to "give it all she's
>> got" and really power up the machine.
>>
>> My point is, that what you are seeing is a half-powered-up system.
>>
>> This is most likely because the timing on the power supply is bad, or
>> voltages are not 'clean' right away. These are both signs of an old,
>> failing, power supply. I suggest you test it, or find an alternate power
>> supply to see if the issue continues after swapping it.
>> -----------------------------------------------------------------------
> Thanks Paul,
>
> Or the video card, or the MB itself? Hmmm. Looks like I might have to start
> switching out components.
>
> Bob S
>
> -----------------------------------------------------------------------
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For what it's worth, I suggest swapping out the power supply first. It
is not unusual for them to fail over time, where it is unusual for a
video card to fail (in this manner).
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