Question about Biostar GEFORCE 6100-M9 Motherboard

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Motherboard: Biostar 6100-M9 with Opteron 165, cold start problem

The system works perfectly, including warm restarts. It also overclocks very nicely but this has nothing to do with the problem.

Problem: once powered off, it will not power on again with the normal soft switch button. Only when pulling the AC plug or switching off the PSU at the back of the machine for like ten seconds, then switching on again the machine can be started normally. That is, a power cycling routine is always required for a cold boot.

I've tried two different PSU's, same behavior.

I've also tried to reset the bios but the problem persists.

I tried another cpu in this MB, a single core Amd64. Then it worked normally.

So it seems like the problem has something to do with the particular dual core cpu I'm using. I use the latest bios released for this MB.

How can this be solved? I find it extremely strange that this cpu works perfectly in this rig in all other aspects but this very basic one... Of course it is possible to live with this awkward startup routine I guess but it would be very nice if it could be made to behave normally.

Many thanks in advance for all input!

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  • 2 more comments 
  • Håkan Sterner May 22, 2009

    It is a good quality 350 W Fortron PSU with lots of current on the 12V rails. Rather old though. The other PSU I tested was in a similar class. i.e not extremely powerful but good quality. Maybe it is too weak after all and that it shows in this peculiar way. Perhaps there is some kind of protection in the PSU that kicks in to prevent overload.

    When I think of it, I immediately fried a 430 W Antec PSU not too long a go after I installed a new graphics card in my son's rig, also dual core Opteron. It wouldn't even start the computer, the PSU only emitted a strange rising beep like it was about to explode... That computer worked perfectly after I installed a 600W Fortron Epsilon.

    I'll try this, thanks!

  • Håkan Sterner May 31, 2009

    I upgraded the power supply to an FSP Fortron Epsilon 600W. This is a very good power supply that I have used before in more power hungry machines.

    Unfortunately it didn't help. The annoying start-up behavior is exactly the same as before, the machine needs a power cycling with a delay of approx 10 seconds in order to start up again from "cold".

    It is such a pity that this machine that works so beautifully in all other aspects suffers from such an annoying defect. I even had the mainboard sent back to the dealer, it came back in the exact same state: they claimed it tested ok, nothing wrong with it according to them.

    As I said, it works normally with some cpu:s, it is just that the cpu I prefer for this machine - Opteron dual core - produce this stupid start-up troubles.

    Bottom line: problem is still unresolved, proven not to be PSU-related. Anyone have any other ideas?

  • Håkan Sterner Jun 01, 2009

    PS. The other FSP Epsilon 600 I have powers a similar system, only that it is a slightly overclocked dual core Opteron 185 (@ 3 GHz) and a moderate SLI graphics configuration. No problems whatsoever, rock steady voltages at all system loads just as it should be with a well suited high quality PSU.

    The system I have problems with is clocked much lower and has only a single graphics card that draws approx a quarter of the graphics in the gaming rig. It behaves exactly the same with the FSP Epsilon 600W as it did with a 350W FSP PSU. The PSU operates at only a fraction of its capacity as measured by a Watt meter, 220 W typical under load so it is nothing.

  • Håkan Sterner Jun 01, 2009

    Thanks for inspiring me to rule out the PSU as a potential problem as this was one of the possibilities that seemed possible given available information. It feels good to know I have a PSU now that doesn't have to operate close to its limit. Also much better efficiency figures in the new PSU that is 80+ certified, this may save some money on the electrical bill over time.



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What is the wattage of your power supply?
If is 600 watts or less you'll need a 650 watt or larger.

Posted on May 22, 2009

  • Mark Gough May 31, 2009

    If you'll read again for any dual core motherboard a minimum of 650 watt power supply is required.


  • Mark Gough May 31, 2009

    Yes the problem is the power supply the only power supplies that are dual core certified are ones that are l650 watt or larger. Been doing this for over 28yrs.



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