m2n32 boot problem

[bailif]

Hello

parts: asus m2n32sli-d, gef 7900gt, goodram 2x512 667 dual, tagan 480W.
when i power it on green led lights up and everything starts, after 3sec
everything goes down, just green led is still on, when i disconnect 4pin 12V
cable (this one near pci-ex) and power on computer it goes on and on, fans
working on cpu and graphic card but nothing is on the screen and nothing
happends in next few minutes
would be great if someone could help

regards

 

[Rod Speed]

parts: asus m2n32sli-d, gef 7900gt, goodram 2x512 667 dual,
tagan 480W. when i power it on green led lights up and everything
starts, after 3sec everything goes down, just green led is still on,

Most likely its deciding that its got a serious problem
like the cpu fan not running and so shuts down for safety.

when i disconnect 4pin 12V cable (this one near pci-ex) and power on
computer it goes on and on, fans working on cpu and graphic card but
nothing is on the screen and nothing happends in next few minutes

Thats most likely because the cpu isnt running anymore with no 12V.

would be great if someone could help

Bit tricky to diagnose since it shuts down so quickly. I'd try it with an
absolutely minimum of hardware, no video card at all, no other cards.
See if it still shuts down in that config.

While the cpu fan runs with the 4 pin 12V cable unplugged, that doesnt necessarily
mean that the speed is still being reported back to the system properly.

 

[bailif]

Most likely its deciding that its got a serious problem

like the cpu fan not running and so shuts down for safety.

cpu fan is runnig, i see it

Bit tricky to diagnose since it shuts down so quickly. I'd try it with an
absolutely minimum of hardware, no video card at all, no other cards.
See if it still shuts down in that config.

tried that too, everything is disconnected now; hdd, whole ram, graphic
card, dvd, but this does nothing

While the cpu fan runs with the 4 pin 12V cable unplugged, that doesnt necessarily
mean that the speed is still being reported back to the system properly.

without this cable fan is running, what do You mean "speed is still being
reported back to the system properly", cpu fan speed ?

regards

 

[Rod Speed]

cpu fan is runnig, i see it

Yes, which is why I said that it may be that the
system cant see that the fan is running properly,
like if the speed wire has come off the fan etc.

tried that too, everything is disconnected now; hdd,
whole ram, graphic card, dvd, but this does nothing

Presumably mean it still shuts down just as quickly.

without this cable fan is running,

Yes, but that may well be because with the 4 pin 12V
cable unplugged, the cpu isnt running, so there is nothing
to decide that the fan isnt running, even tho it is running.

what do You mean "speed is still being reported
back to the system properly", cpu fan speed ?

Yes. The cpu fan has an extra wire which is used to detect
what speed the fan is currently running at. That is used to
decide if the fan has seized, so the system can be shut
down if the fan has stopped rotating for whatever reason.

If for example that extra wire has got disconnected somehow,
the system can no longer see the cpu fan speed, so it should
shut the system down when it decides that it isnt running
anymore, even tho it is actually spinning fine.

With no 4 pin 12V cable unplugged, there isnt any cpu running
to decide that the cpu fan isnt spinning, even tho it is spinning,
so there is nothing to shut the system down because it has
decided that the cpu fan isnt spinning, even tho it is spinning. So
there is nothing to shut the system down, so it doesnt shut down.

The obvious thing to do is to try another cpu fan if you can do that easily.

It can also be a failure at the motherboard end
tho, so the cpu fan speed can no longer be read.

 

[bailif]

i connected my old fan, which has working fine in previous configuration,
but once again that does nothing, any new idea/s ?

regards

 

[Rod Speed]

i connected my old fan, which has working fine in previous
configuration, but once again that does nothing, any new idea/s ?

Check the motherboard for bad caps. Those are the usually blue or
black plastic covered post like things that stick up from the motherboard.
The tops should be flat. If any have bulged or have leakes, those caps
have passed their useby date and that is likely the problem.

Worth resetting the cmos. Its possible that the shutdown trip temp
has somehow got set much too low and that the reason its shutting
down so quickly. Bit hard to check the bios values, likely it shuts
down too quickly to allow you to inspect those now.

Unlikely to be the power supply since it doesnt shut down with the
4 pin 12V connector unplugged, but that is possible. Try another
power supply if you can do that before binning the system.

 

[Paul]

i connected my old fan, which has working fine in previous configuration,
but once again that does nothing, any new idea/s ?

regards

I have a testing suggestion for you.

The BIOS will report serious errors by means of beep codes.
You need to have the computer case speaker connected to the
motherboard, so you can listen for the beeps.

It is possible to run the motherboard with just the CPU
and heatsink/fan installed. The heatsink/fan cable should
be connected to the CPU fan header. The CPU fan should have
three wires on the cable. (One wire is +12V, one wire is
ground, and the last wire is the tachometer pulse signal
that sends two pulses for each rotation of the fan.)

Remove the RAM and video card. This will annoy the BIOS,
because the BIOS cannot finish the POST sequence without
those items. The BIOS will beep when it finds those items
missing.

1) Assemble motherboard, CPU+heatsink/fan, power supply.
Connect computer case speaker to the PANEL header.
Connect the power button to the PANEL header.
Switch on power supply and push the power button
on the computer case.

Does the case speaker beep ? Is the beep code indicating
"Bad or missing RAM" ? That is what the test should show.
Now, turn off the computer at the back, and do the
next test. (Record the beep pattern, like "one long
and three short beeps" and report back your test
results.)

2) Add one stick of RAM. Switch on power supply
and push the power button on the computer case.

Does the case speaker beep ? Now you have a stick of RAM
in there, so the BIOS should be happy with the RAM. Is
the beep code indicating "missing or bad video card" ?
It should be.

If you get no beeps, or if you are still getting the
"Bad or missing RAM" beep pattern, there could be an
incompatibility between your RAM and the motherboard
BIOS.

3) The final test of the sequence would be to add the
video card back in. The motherboard should now be
able to print something on the monitor, if the video
card and monitor are present.

Rod has already explained that the motherboard can shut
down, if it does not detect pulses coming from the CPU
fan tachometer signal. Three seconds is enough time for
a bit of BIOS code to be executed by the CPU, and for
the CPU to check the state of the fan. The CPU is also
equipped with thermal overload protection, but this
might turn off the computer even faster, and thermal
overload protection does not need the CPU to run to
work. It is based on the temperature going too high.

It is also possible for the BIOS to switch off the
computer if it doesn't like the RAM. Recent BIOS
seem to have problems with DDR2-800 RAM, and sometimes
using a cheap stick of DDR2-400 or DDR2-533 is enough
to get the computer to finish POST.

Another thing you might want to verify, is whether the
BIOS release version is sufficient for your CPU. The
motherboard should have a paper sticker on the top of
the socketed flash EEPROM chip. It will have the
BIOS release number printed on it. Look up your
motherboard and check the list for your CPU here.
The BIOS release shown in the table, is the _minimum_
version required to run with the CPU.

http://support.asus.com/cpusupport/cpusupport.aspx?SLanguage=en-us
http://support.asus.com/cpusupport/...name=M2N32-SLI Deluxe&SLanguage=en-us&cache=1

Paul

 

[bailif]

thank You for such answer, i have unplugged all parts except cpu and cpu
fan - that does nothing, i plugged in my old fan to check the original fan -
that does nothing, system speaker dont beep, and my bios ver is 603, so its
the newest version for my mainboard, im starting to think that my PSU isn`t
strong enough, and cant power up dual core processor, so if cpu dont gets
enough power on his line (4pin 12V), he shut down whole machine

regards

 

[Paul]

thank You for such answer, i have unplugged all parts except cpu and cpu
fan - that does nothing, i plugged in my old fan to check the original fan -
that does nothing, system speaker dont beep, and my bios ver is 603, so its
the newest version for my mainboard, im starting to think that my PSU isn`t
strong enough, and cant power up dual core processor, so if cpu dont gets
enough power on his line (4pin 12V), he shut down whole machine

regards

So you are still getting the same symptoms ?

When ATX12V 2x2 connector is connected, computer shuts down in 3 seconds
after the power button is pushed ? (This is with just the CPU installed
on the board, and CPU fan plugged in.) And with the ATX12V
2x2 connector disconnected, the fans stay running ?

Maybe the motherboard itself is bad.

The speaker won't beep, if the CPU shuts down the motherboard
before it gets to the stage of checking for RAM or the video
card. So it still might be related to fan detection or
a CPU diode temperature check by the BIOS.

Does the CPU have thermal paste on it, between the CPU
and heatsink ? Is the original thermal material still
on the heatsink, as provided with the heatsink ?
Are you sure the heatsink is properly seated ?

Paul

 

[bailif]

When ATX12V 2x2 connector is connected, computer shuts down in 3 seconds

after the power button is pushed ? (This is with just the CPU installed
on the board, and CPU fan plugged in.) And with the ATX12V
2x2 connector disconnected, the fans stay running ?

yes, exactly

Maybe the motherboard itself is bad.

damn it, i will try today with another psu, a bit stronger than mine, and
we`ll see then, if nothing will change after this, a will get back to shop
with this mb

The speaker won't beep, if the CPU shuts down the motherboard
before it gets to the stage of checking for RAM or the video
card. So it still might be related to fan detection or
a CPU diode temperature check by the BIOS.

Does the CPU have thermal paste on it, between the CPU
and heatsink ? Is the original thermal material still
on the heatsink, as provided with the heatsink ?
Are you sure the heatsink is properly seated ?

i cleaned up cpu and heatsink with isoprophyl alcohol, and now between those
two is Arctic Silver 5 thermal paste, a did it really precisely, so the
problem is somewhere else

regards

 

[Rod Speed]

i have unplugged all parts except cpu and cpu fan - that
does nothing, i plugged in my old fan to check the original
fan - that does nothing, system speaker dont beep, and my
bios ver is 603, so its the newest version for my mainboard,
im starting to think that my PSU isn`t strong enough, and
cant power up dual core processor, so if cpu dont gets enough
power on his line (4pin 12V), he shut down whole machine

It would be unusual for a PSU to take 3 secs to decide that
it cant provide the 12V current that the motherboard is asking
for. That situation would normally see the PSU not start up at
all, so you dont get the 3 secs of fan activity etc.