Z68X-UD3H-B3 reboots using onboard graphics

[Gloup_Gloup]

Hi dikal, 

Do I understand you have to be satisfied with your situation now?

About optimized Defaut and Fail Safe Default , see your manual page 35-36

Extract:
Load Fail-Safe Defaults
Fail-Safe defaults are factory settings for the most stable, minimal-performance system operations.

Load Optimized Defaults
Optimized defaults are factory settings for optimal-performance system operations.  (The final choice in Standard situation)

But nothing prevents you to make manual adjustments. But be careful and read the documentation or visit us again .

Gloup_Gloup

[dikal]

Hi Gloup_Gloup

In conclusion:
When I use only the onboard VGA (no expansion VGA installed), the system reboots, without BSOD, error messages etc.
The situation now is that I have installed an expansion VGA, and the reboots are gone.
But I try to find out what is the cause of the problem.

Obviously I am not satisfied with it, so I posted my problem to find some help.
Before that, I did a lot of testing, a lot of seaching in the web and read every single page in the manual. Thank you for your investigation anyway.  

The whole problem is described here:
http://forum.giga-byte.co.uk/index.php/topic,7701.msg60944.html#msg60944

Thank you all in advance for your kind help  

EDIT:Dark Mantis, do you think that this:http://www.tomshardware.co.uk/forum/272839-12-solved-state-support-problem is a similar situation?
we have the same symptoms, and the same PSU! Please look at this http://www.tomshardware.co.uk/forum/272839-12-solved-state-support-problem#t1912519 post, if you have time.
Thank you very much 

[Dark Mantis]

Gloup_Gloup is trying to help you but struggles at times with the English language, so sometimes things get confused. Please don't take offence if he posts something that doesn't seem to be right, it's just a language problem. 

[dikal]

Gloup_Gloup is trying to help you but struggles at times with the English language, so sometimes things get confused. Please don't take offence if he posts something that doesn't seem to be right, it's just a language problem. 

Yes, I know that Gloup_Gloup (and all of you in this forum) tried to help me, and I' m really thankful of that. I' m sorry, but my English is bad, too.

Have you seen my EDIT in the previous post?

[Dark Mantis]

I admire all of you who come onto the forum and answer posts who don't have English as your native language. It's more than I could do.

Re EDIT:

I wouldn't be at all surprised if it did turn out to be your power supply that was causing the problem. If you notice back in my first post that was what I pointed to.

I am a big fan of single rail PSUs (as most of you will have noticed  )  and except for the very big power supplies I feel that it is  much safer to use a single rail type where there is more flexibility as to power direction to different devices. On some of the big PSUs (1000W+)  that have split rails they do not have such a problem because each rail probably still carries 30A or more.

As far as the XMP goes it would be a good idea to manually set up the timings and voltage by hand in the BIOS rather than leaving it up to the Auto setting. That way you can have the benefits of the performance withoput the problems that sometimes are associated with XMP being enabled.

[dikal]

Thank you Dark Mantis.
Of course I do remember that you pointed at the PSU, right from the start.
So I will try to find a bigger (or single rail) PSU just to be sure about it.
I will post again to inform the forum.

DiKal

[Dark Mantis]

I do understand that it is something that you don't particularly want to do when we are nmot 100% sure that is the problem. You could of course RMA the other one if it is still under warranty. The Corsair ones have a five to seven year warranty on them and there are a few others that carry a three years plus coverage. The only trouble with going down this route is that you are without your system until it is returned. I would bite the bullet, buy a new top end one and then send the other for repair and keep as a spare later on. I would recommend a make like Corsair, Seasonic, CWT, Thermaltake, Enermax, Gigabyte, Coolermaster, Antec as they are all good reliable units.

[dikal]

I can see that it is still under warranty (5 years). I will RMA it if I can manage to find another replacement while waiting.
Thank you all once again. 

[Dark Mantis]

No problem you are welcome. Please let us know how you get on though.

[dikal]

Problem solved.

I tried one more test, using 2 PSU's working together (my old PSU Thermaltake 500W and a Coolermaster 460W). The system worked fine when using  the Coolermaster's 2x18A rails (one for the 24pin main power connector, and the 2nd for the 8pin 12V connector), and one 18A rail from the Thermaltake's PSU for the hard disk drive and the DVD.

So the problem was the insufficient Thermaltake's 3rd 12V rail (only 16A), which powered the motherboard's 24pin main power connector, the hard disk drive and the DVD (HDD and DVD need 0,5A+2,0A=2,5A).

Thank you all for your assistance. 
Merry Christmas and a Happy New Year everybody !!

[Dark Mantis]

I can't say I am surprised as quite often the prolem can be laid at the feet of the PSU. Many people won't have it to be though and willl swear blind their PSU is powerful enough and we can't know what we are talking about. The thing is it is not just about overall power but about how it is delivered as well.

Anyway pleased you have it all sorted now. 

[dikal]

Thank you, Dark Mantis.