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- Two motherboards, no post beeps
October 27, 2005, 2:08 pm
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I had the following system:
* Athlon 2600 XP (266FSB)
* A7A266 motherboard
* Thermaltake Volcano CPU cooler
* Radeon 9800 graphics card with VGA Silencer cooler
* Mesh computer case
One morning I tried to turn on the machine, but found that it wouldn't
up. The fans, motherboard light and case light powered up, but there
was no video or no error beeps.
I tried swapping in a new CPU, new memory and a new power supply,
without any luck.
After this, I replaced the A7A266 with a new A7N8X Deluxe. When I boot
up, almost the exact same symptoms as before. Motherboard light and
fans on (except this time, no power LED on, despite the fact I
connecting/reconnecting the appropriate lead to the motherboard), but
no bootup. I tried connecting earphones to the onboard sound out to see
if there was any vocal POST report, but nothing.
I stripped down the machine to just the motherboard, CPU and cooler, to
see if a "no memory detected" error would be produced. Nothing.
I'm going mad here. Could two power supplies be faulty? Could it be a
problem with the case (I can't see how) or even my electricity supply?
Re: Two motherboards, no post beeps
On 27 Oct 2005 10:08:13 -0700, "oceanclub"
First thing to do in such a scenario is to only remove
non-essential parts, like disconnecting drives and other
cards, then clear CMOS. Also check the battery voltage.
There is the possiblity that two boards aren't working for
different reasons, not one long culprit causing both combos
to not work.
Essentially it's best to limit variables as much as
possible. Not that what you did won't work too, but in an
effort to leave as few stones unturned as possible before
the additional expense of buying more parts, it is good to
backtrack and mack a checklist of what has and hasnt' been
Was the new power supply known adequate? I suspect both of
your boards use 5V for CPU and thus need a fairly good (high
accurate rating for) 5V current to work. If either PSU is
generic, they may have somewhat inaccurate ratings too.
Did you clear CMOS (with AC disconnected) on this one as
well? Even on a new board, it can still be good to check
the battery. I know this board in particular may not post
at all with a dead (or overly low) battery.
At this point it might not hurt to take power supply voltage
readings, with a multimeter.
If you had a PCI video card, or at least another AGP
(preferribly one that has least power consumption possible
if you have a choice) you should try it.
Faulty, maybe, or just insufficient for the current
required. Try the boards on a desk, not on anti-static mat
or packaging, with only CPU, memory, heatsink/fan, and
video. Clear CMOS again. Try another video card.
It's very unlikely to be your AC supply since the fans were
running- the power supply should shut off if it cannot
output appropriately no matter what the incoming AC is.
This presumes at least reasonable quality PSU, if it's
low-end junk then find a known good, adquate PSU with at
least 200W combined 3V/5V rating, preferribly even more with
the Radeon 9800 card installed... but of course the fewer
parts you have hooked up, the better the chance of being
under the max capacity possible from an unknown
true-psu-capacity on a generic... IF it was one (just trying
to cover more bases without this info).
Do all your fans work, or at least spin freely? For
example, the video card fan? I was about to write that I"m
almost paranoid about video card fans failing, but since
they do tend to be one of the (by far) shortest lived parts
in a system), it's not paranoia at all, just acknowledgement
of a common problem. If the fan has failed, definitely try
some other video card even if you have to hunt down some
circa-'95 1MB PCI card on ebay for $2.
Re: Two motherboards, no post beeps
This happened to me yesterday, too. Lucky for me, it happened to me almost
the same day every year, so I know what causes it.
Yesterday is the first day we got snow this year and I haven't turned on the
heater yet. Open the case, I can see the capacitors are in pretty bad shape.
So I replace with a new motherboard with fresh battery. After clear the
CMOS, still the same problems (mobo led on, fan on, but no beep and no
post.) I unpluged the computer and push the on button for 8 seconds to
discharge the capacitors. Then I kept the computer unpluged and went to do
But as it happened every year, in the afternoon, about four hours after I
replaced the battery, capacitors came to life, I turned on my computer,
everything is normal again.
Everything in your system is fine except the capacitors.
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