GA-EP45-UD3LR Restarts After Shutdown

[Karlston]

That's bizarre...

If you hadn't swapped PSU's, I'd say it was the PSU. Or a sticking Power button/switch, but you've checked that too.

What happens if you have the Soft Off set to 4 seconds, and you shutdown from your OS?

Grasping at straws... "AC Back Function" BIOS setting?

[Dark Mantis]

What is EuP set to?

[3246251196]

Thankyou for your help so far.

I have just done some more testing and I can confirm that when in BIOS if SOPB (I will call it from now on [Soft Off Power Button]) is set to 4 seconds and I hold in the power button on the tower for those 4 seconds the computer correctly shuts down.

If, however, the SOPB is set to Instant Off and I press the power button on the tower it will turn off instantly and restart after ~~5 seconds.

This may be iteration, but it is now a fact.

Also, DM, I have looked in my BIOS and there is no EuP or Energy using Products option.

>>

Is there anyway I can tell the OS's shut down function to do whatever the system is doing after holding the power button in for 4 seconds?
It is like these are two different functions.

>>

EDITED: I previously said:
"Also, I have noticed that the computer seems to stay turned off when there sounds like (just before the computer powers off) - what I can only describe as - a clicking noise. It is as if some device needs to properly shut down to prevent the computer from restarting: As if, this device needs to "click" off. Then everything seems fine. It is still inconsistent, but its more information for you all."

Today, I am not sure about this. Whether something is "clicking" I am not sure; it is hard to tell when SOPB is set to Instant Off because there is, of course, the noise of the power button going in which would happen at the same time as the device "clicking" off. Again, this is just extra information.

[Dark Mantis]

You will find "EuP" in the BIOS under Power Management Support

http://download.gigabyte.eu/FileList/Manual/mb_manual_ga-ep45-ud3l(r)_v1.1_e.pdf

EuP Support
Determines whether to let the system consume less than 1W power in S5 (shutdown) state.
(Default: Disabled)
Note: When this item is set to Enabled, the following four functions will become unavailable:
PME event wake up, power on by mouse, power on by keyboard, and wake on LAN.

[3246251196]

My verison of Power Management Support definitely does not include an option for EuP. In fact, it is identical but for the EuP option at the end.

[Aussie Allan]

  A short to ground can produce this quirk......where you'd start looking is another question.......recheck.....power pin header all the way to switch,
.........£10 will get you a Ohmmeter.....Pull the 2 wires off the power header and check for a short in the on and off.........or if you have a spare switch and wires  just for testing even better

  M/B to chassis short.........Possible!

 A bare wire touching case........could even be a foreign object (washer,screw ect)........may not be the answer, but something else to check.

 Aussie Allan

[3246251196]

Thanks Allan,

I will take a look at this. But, I almost feel like it is ruled out given that I have shorted the PSwitch connectors; changed the PSU; and previously took out the motherboard from being mounted in the tower - I had it out of the case and stripped to minimum hardware. Though, this was the older DQ6.

It is crazy that the older DQ6 done the same thing!

I guess I can try doing the same to this motherboard: stripping it and unmounting it.

The only consistent hardware that was kept from that older motherboard was the CPU and Video card. Could it be those!?

I will post more information tomorrow, while some of you try and get your heads around this most... unbelievable problem!

Furthermore, if it is solved I will certainly post the solution here; even if it turns out to be something embarrassingly simplistic and erroneous on my part!

[Aussie Allan]

 It's one of the better one's I've seen in quite a while.......missed the other DQ6 though!.......what's the common denominator!...CPU and GPU

  If there the only thing's carried forward with the problem, very high probability it's one or the other, CPU is ahead on points, can you get your mitts on another CPU of a similar spec to pop in...........OR...........visa versa with another similar board.........would make thing easier fault finding.

 Aussie Allan

[3246251196]

If we just knew what the difference was between the 4 second POSB and the Instant Off POSB. Why is it that on 4s a proper shut down proceeds, and on Instant Off a non-proper shut down occurs.[?]

The e6750 I have is the only C2D I have in the house.

Anyone else with any more information, please post. For the time being, I will try and work on those suggested tips.

[Aussie Allan]

  I think the 4 secs is for critical data dump for fault analysis........probably wrong though........my guess meter has been off this week a few times.

  Aussie Allan

[3246251196]

- Do you see the point in getting an ohmmeter if I have tested this with another PSU?
- Is it possible that a CPU could cause this problem?
- Would upgrading BIOS help at all?
- Any idea where else I could post about this problem? I will try Intel forums, I suppose.

Right now, I cannot really test with another CPU.

Thanks.

[3246251196]

Having upgraded my system to a new motherboard - Asus, I can confidently say that the culprit was Gigabyte motherboards. Bye bye Gigabyte.

[he1senberg]

The problem basically was: Your southbridge have problem (or LAN chip).

If a MOBO shut's dow'n and anfet 4 sec turn's ON, can be 3 basically things.

Something related with LAN
Something related with Bios config.
Something related with SB.

Of course, talking about hardware problems.

In some new models can be the ME_BIOS chip.