Startup problem...which part is to blame?

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

"Jim Smith" <jim_smith@livejournal.com> wrote in message
news:ff0d2d30.0406091030.199354a8@posting.google.com...
> I successfully built my first PC last year without any trouble, and
> now my brother has decided to trust me with assembling another one for
> him. Unfortunately, this time I can't get the computer to boot. When
> I turn it on, all that happens is that the fans start and the lights
> come on in whatever parts I have connected. The POST code on the
> motherboard is FF, which I assume is fine since that's what the
> computer I'm using now is showing. I have yet to get the new project
> to give me a single beep or display anything on monitors that I know
> work.
>
> Something's wrong, and I'm coming to accept that I may have to replace
> a part. I just don't know which one. I can't think of anything I did
> to damage the motherboard, but so far it seems to be the most likely
> culprit.
>
> If anyone can help me figure this out, I'd appreciate it. My
> brother's gonna kill me...

That is most likely the CPU or motherboard, in that order. What make/model
motherboard? Which CPU? Is the HSF fan connected to the motherboard's cpu
fan connector? Is that fan running? Can you hear the hard disk(s) spinning
up eventually? IF SO, then that might point toward a video card or RAM
problem. But if it was video card or RAM, your POST code would probably not
be FF, and you'd probably get some kind of "beep" error, as well. No beep
at all indicates to me that the CPU isn't even running POST. As the
mainboard is giving FF as a post code, this looks suspiciously like a bad
CPU. Or the CPU could just need to be reseated. Another possibility is a
bad power supply, but that's less likely. Basically, the CPU looks for good
power. If it sees power good, it attempts to run POST. During POST, your
video card might be initialized (if it gets that far). But it sounds like
you aren't even getting as far as the CPU starting POST. Most likely
suspect at this point is CPU, I'm afraid. A real long shot . . . have you
tried clearing CMOS settings on the mainboard? I don't think that will
help, but it won't hurt. Good luck, -Dave

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

On 9 Jun 2004 11:30:38 -0700, jim_smith@livejournal.com (Jim Smith)
tortured a bunch of electrons for some unknown reason:

>I successfully built my first PC last year without any trouble, and
>now my brother has decided to trust me with assembling another one for
>him. Unfortunately, this time I can't get the computer to boot. When
>I turn it on, all that happens is that the fans start and the lights
>come on in whatever parts I have connected. The POST code on the
>motherboard is FF, which I assume is fine since that's what the
>computer I'm using now is showing. I have yet to get the new project
>to give me a single beep or display anything on monitors that I know
>work.
>
>Something's wrong, and I'm coming to accept that I may have to replace
>a part. I just don't know which one. I can't think of anything I did
>to damage the motherboard, but so far it seems to be the most likely
>culprit.
>
>If anyone can help me figure this out, I'd appreciate it. My
>brother's gonna kill me...

Motherboard could be shorted to the case by a misplaced post.
CPU fan plugged into the wrong header.
You don't have all the power connectors connected to the motherboard
and/or video card.

Stephen


--

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

I had this problem and it was the power supply.
Pin 8 has a power ready signal on it that is controlled
by an RC cirucuit in the power supply. One of the
guys in this group taught me all this a little while ago.

The cpu looks there to see if it's ok to run the post.
Some mobos are picky about this, and some aren't
so picky. I swapped out a ps from an old P2 400
system, and it booted the new system fine. The new
ps booted the old P2 400 system fine, so I just
swapped them.

What was driving me crazy was the new ps, in
the new system, that wouldn't boot, had all of
the voltages on all of the pins within spec. It was
just that the power ready signal on pin 8 was
coming up a couple of thousands of a second
too slow for the mobo, and I didn't know that.

Just a thought, but it could be that simple.

Alby

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

jim_smith@livejournal.com (Jim Smith) said:

> Unfortunately, this time I can't get the computer to boot.

Just take it all apart and start over, being extra, extra careful that
things are plugged in the right way, all the way, where they're supposed
to be, etc.
--
Mac Cool

Archived from groups: alt.comp.hardware.pc-homebuilt (More info?)

Are the front power and reset switches connected right??


--
Tumppi
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"Stephen" <stephen2002{NOSPAM}@lurker.homeip.net> kirjoitti viestissä
news:lk6fc09n0siis9cu738oopoq438a0hib5i@4ax.com...
> On 9 Jun 2004 11:30:38 -0700, jim_smith@livejournal.com (Jim Smith)
> tortured a bunch of electrons for some unknown reason:
>
> >I successfully built my first PC last year without any trouble, and
> >now my brother has decided to trust me with assembling another one for
> >him. Unfortunately, this time I can't get the computer to boot. When
> >I turn it on, all that happens is that the fans start and the lights
> >come on in whatever parts I have connected. The POST code on the
> >motherboard is FF, which I assume is fine since that's what the
> >computer I'm using now is showing. I have yet to get the new project
> >to give me a single beep or display anything on monitors that I know
> >work.
> >
> >Something's wrong, and I'm coming to accept that I may have to replace
> >a part. I just don't know which one. I can't think of anything I did
> >to damage the motherboard, but so far it seems to be the most likely
> >culprit.
> >
> >If anyone can help me figure this out, I'd appreciate it. My
> >brother's gonna kill me...
>
> Motherboard could be shorted to the case by a misplaced post.
> CPU fan plugged into the wrong header.
> You don't have all the power connectors connected to the motherboard
> and/or video card.
>
> Stephen
>
>
> --