Motherboard does not boot after hard power off

drhowarddrfine said:
OK. So I'd bet you have one connector that's not hooked to anything. Or you can remove a connector to a peripheral device like networking or the graphics card. Black is ground. Measure the voltages on the other pins. You should have something on all or most of them. But you only need to test one connector.
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I do not understand. What do you call connector here?
I could remove some peripherals, but not the place where they are connected.
Should I test that peripherals get electricity from their connectors?

blackbird9 said:
Power supply connector pinouts here. This might be a bit tricky to measure however, with the connector plugged in. Perhaps you can try on the other side of the board where the connector pins come through, if you can access the back. What's really needed is a breakout connector cable.
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You mean to test that plugged cables of the PSU are really plugged in the motherboard?
i.e. there is really connection?
Why should that have changed with the hard power off?
Why should such a problem prevail after taking other PSU?

blackbird9 said:
look at the screenprint layer on the PCB itself and see if you can identify any test points; there may be test points for 12V, 5V etc.
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How to identify them? What should be written there?

blackbird9 said:
OK, here's a useful trick to test the PSU standalone. Check that the PSU is producing the correct output voltages, that's a good first step.
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I have done that many times with different PSUs.


Espionage724 said:
I had a M4A88TD or something very close to that model; the BIOS chip was socketed/removable.
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In a previous post you see an image of my motherboard. Bellow right, between BIOS Battery and IDE connector you
see a removable chip with 8 pins. Is it that the BIOS Chip?
 
Espionage724 said:
I had a BIOSTAR mobo too and booted it to Linux LiveUSB and flashrom'd the ASUS BIOS image to the chip and put that chip in the ASUS board (I broke a pin off the original ASUS chip and took another BIOS chip off a 3rd unrelated board :p)
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I do not understand. You had A, you flashrom'd B and put it in the B board.
 
It sounds a bit late in the process, but one of the things that I always do first when a system isn't responding to a button, is to disconnect the power and hold the power button for a good 30 seconds. For some reason that seems to dissipate enough of whatever residual power is in the system so that when I plug it back in that the system will respond again to the power. It's usually more of a monitor thing, but I've occasionally had issues with the computer itself not turning on. It's one of the downsides to the more modern power supplies where they turn on and off based on what the system tells it to do.
 
What we're trying to do is just establish that the power supply is working with a very fundamental test. By taking the negative lead of the voltmeter, the black one, and touching the black wire of one of the connectors (or the metal of the case but that might not work) and then touching the red lead of your voltmeter to a red wire (likely +5 volts) or yellow (possibly +12 volts) it might indicate your power is OK (though not definitely).
 
I have just realised that all of my UEFI based systems have done this at some point in time. I hadn't really put much thought to it other than it being a glitch. An ASUS N3150I based system I have did it yesterday after executing poweroff . It was totally unresponsive to power on/off and reset buttons. I had to switch it off at the UPS. I left it unplugged for a while pressing the on/off and rest switches while it was unplugged. When the UPS was powered up again the system needed to go into UEFI setup. No settings had changed, but it would not start until I pressed F10 to save settings. None of my old pre-UEFI hosts have done this. I am going to keep an eye on this problem now recording each incidence in my written event log.
 
drhowarddrfine said:
What we're trying to do is just establish that the power supply is working with a very fundamental test.
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It is definitively working. I had never doubt of it. There were two PSU with same symptoms.

The standby led on MB lights. Consume appears when I power on the MB with the
button and disappears when I power off. The fan I put when trying to flash the bios moved. ...

Mjölnir said:
AMD Athlon II: That's about 15 years old. Maybe the board the just dying from senility.
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I have older hardware working. I just bought this second hand.

Perhaps it is dying because of the fan-less configuration, but the PSU (the original, not the one I use for my tests),
not the MB. The CPU has 40 TDP, I think the heatsink is overdimensioned in my opinion. But a PSU without fan?

I cannot separate till now the PSU from the case, is perhaps so fixed in the case in order that it dissipates
the heat on it, but it is not like the dissipator of the CPU.

It is painful, I was enthusiastic with the idea of a completely fan-less system. Perhaps I learned something.

UPDATE: And perhaps the MB 'senile', all the time hang vertically on it a heatsink that weights perhaps 700g.
I think even horizontally would be too much.
 
hruodr where are you located? This starts to look like something best diagnosed with a beer and some spare parts to check against.
 
Even with that large heatsink, its going to struggle to cool the cpu with the case closed, unless the case fans or the power supply fan is moving enough air through the case. If the led is lighting up on the motherboard, something is working. Perhaps the cpu has gone, or the voltage regulator. The heatsink paste on the base of your heatsink didn't look very convincing to me, either, you could always try some new paste.
 
Crivens said:
I'm sitting near Buch, so if you need something which might be in my man-cave, please let me know.
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Thanks a lot for the offer!

BTW, when I lived in Munich, we had a BSD group and met regularly (once or twice a month).
This FreeBSD forum became a good replacement.
 
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