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Thread: GA-EX58-UD5 POST C1 Boot Cycle




  1. #1
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    Default GA-EX58-UD5 POST C1 Boot Cycle

    Hello,

    I've scoured the forum(s) here and elsewhere looking for things that I can try but cannot seem to resolve my problem.
    I'm hoping that someone can maybe point me in the right direction.

    Here's the specs:
    Motherboard: GA-EX58-UD5 Revision 1.0
    CPU: Core i7-920, S-spec: SLBCH
    Memory: 12GB Corsair Dominator TR3X6G1600C8D, 1x v2.1 + 1x v3.2
    PSU: Antec Signature 850 Watt SG-850 Revision 00F

    Basically, the machine's been running solid for almost a year with all stock clocks running the F4 BIOS.
    Then just a couple days ago I noticed that the RAM wasn't running at 1600 anymore, it was set to 1066.
    So I entered the M.I.T section of the BIOS and chose Profile1 under the XMP dropdown.
    I saved the changes and the machine went through POST fine and I was back in business, or so I thought.
    After about 5-10 minutes of heavy graphics/cpu utilization the machine rebooted on me.
    It did this several times while I tried to figure out what could be the cause, checking temperatures and running memtest and check disk.

    Finally I went back into the BIOS under M.I.T and I received a bright red box telling me that some overclocking or voltages were set incorrectly and it was causing boot failures.
    I chose to load the optimized defaults and save and the machine came back up.
    I thought maybe I should flash the BIOS to a newer version since there have been 9 updates to it on Gigabyte's site since mine.
    Without thinking I used the @BIOS windows utility to preform the flashing and then when the machine rebooted it got stuck in some POST boot cycle and that's where I'm at now.

    I've tried several things that I've read on this forum for getting back into the BIOS.
    Unseating all the ram and trying all the sticks in all the different slots individually.
    Booting up with nothing connected but the DVD drive and the motherboard disc inside.
    Unfortunately I had the floppy disabled in the BIOS before the flash so I couldn't try it with the flashspi.exe/EX58UD5.F12.
    I've used the Clear CMOS button on the I/O panel, even left the CMOS battery out overnight.
    Even tried kick starting the DualBIOS by performing some steps I read here, leaving the power button in when turning the PSU on, then turning the PSU off and trying to start it like normal.

    If I boot up with no ram and just the CPU the machine stays on and stays at C1 in the POST. If I leave any of the sticks of ram in any of the slots it boots up for several seconds, POSTs C1 and then reboots.

    I'm at a loss of things to try. I'm unclear now if I bricked it flashing in windows or if there's a problem elsewhere with the ram maybe.

    Any suggestions on what else to try or what could be causing this?

    Thanks so much and sorry for the novel!

  2. #2
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    I have a ud5 rev 2.0 and well when i get c1 and the clicks it means OC failed, it keeps flashing b/c thats the bios checking the cmos over and over to see if its stable to boot. You have a backup bios? if so there is a way to boot to it manually.

  3. #3
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    Backup as in the Dual BIOS feature, or a copy of the flash file?
    My understanding is that the board should have a secondary BIOS to boot to but I can't seem to get it to activate.
    I do have an old copy of the F4 around on a floppy though too if that's what you mean. ( but the floppy drive is disabled with the current BIOS )

  4. #4
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    Do you have a steady hand?

    If so I can show you how to boot from the Backup BIOS, that way you can reflash the MAIN BIOS.

  5. #5
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    It's been a while since I've soldered or anything like that but if it'll get this board working again I'm game. Thanks!

    What would you recommend reflashing the main BIOS to? The older F4 that seemed to work fine for such a long time for me or should I try the F12 again?

  6. #6
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    No soldering is needed at all.

    All I asked for was so you could hold a short. To flash from the backup BIOS you need to short the MAIN BIOS, I'll show you how if you want to do it (It's easy)

    Do you have needle or fine tipped tweezers?

    I'd go ahead and flash F12, but you MAIN BIOS will probably auto recover to F4 at first, then once you get it going again you can safely flash F12 using Qflash.

  7. #7
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    underflow i have the same board as you and been using f12 bios for months,works fine for me,i think with 12gb you needed to tweak the qpi/vtt voltage as settings will vary from bios to bios,meaning you will need to tweak things slightly to remain stable,i find f12 to be a good stable bios though and seems to need less voltage than the newer beta bios's
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  8. #8
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    Great, thanks a lot for the information.

    I'll try the shorting in a little bit to see if I can back into the BIOS to tweak those settings.
    I had read that the QPI voltage needs to remain within ~.5v of the ram voltage.
    When selecting Profile1 for that ram it takes the voltage up to 1.65.
    The strange thing is that I've used that setting for the ram for a very long time without changing it back and to have it switch and cause me problems when I tried to reinstate it seems odd to me.

  9. #9
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    PM sent on recovery, let us know how you get along tonight.

    1.65V is probably your rated memory voltage, that only means QPI/Vtt must be at least 1.15 or above in regards to the remaining within 0.5V rule.

  10. #10
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    Default Re: GA-EX58-UD5 POST C1 Boot Cycle

    I tried bypassing the main BIOS for the backup BIOS and what happens is it initially boots and POSTs 88, then quickly reboots and POSTs C1 where it hangs for several seconds and repeats.
    I did see a POST 11 briefly after a few runs through trying to get the secondary BIOS up but after it rebooted it started the previous pattern of boot cycle.
    I'll try a bit longer seeing if anything different happens.

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