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Thread: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?




  1. #1
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    Default GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    Hi all,

    System Spec.
    Motherboard: Gigabyte GA-Z87X-UD5 TH
    CPU: Intel I7-4790
    Video: Onboard
    RAM: Crucial Ballistix Elite 1866 1.5V 2x8GB
    PowerSupply: Corsair TM750M

    I'm troubleshooting my new system as it's stuck in a reboot loop.

    Symptoms:
    In Dual BIOS mode: (switch 1 set to 1)
    - Powers up for a split second and then powers off. no DEBUG code available
    - Attempts to power up backup BIOS for a split second then powers off. no DEBUG code available.
    - Alternates over and over.

    In Single BIOS mode: (switch 1 set to 2)
    - Powers up and stays on but no DEBUG code, no onboard display
    - Same for both Main and Backup BIOS (switch 2 set to 2)

    I've gone through the forums and have tried:
    - Resetting the CMOS via CMOS reset button
    -- Same symptoms

    - Resetting the CMOS via removing battery
    -- Same symptoms

    - Removed all components
    -- Same symptoms * Should I expect to see DEBUG codes when nothing except for the power supply is connected to it? I would think so.
    -- I've swapped power supplies to a Corsair AX1200 that is known to work

    I don't have spare memory or CPU but have ordered a spare CPU to hopefully rule that out.

    I would've expected the motherboard to show DEBUG codes when there is nothing connected to the motherboard other than just power.

    Can I get a confirmation on what happens with a working motherboard when nothing is connected to it? I think it's strange that the BIOS, main and backup, would not post or that there are no debug codes to help troubleshoot.

    Other notes, This is the 2nd motherboard, the first one had a reboot loop issue as well but would loop in all BIOS switch configurations. But because both motherboards have similar problems I am suspecting CPU or memory but I'd like to understand what happens when nothing is connected. So I can rule out the motherboard.

    Any other thoughts or tips would greatly be appreciated.

    Best,
    J.

  2. #2
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    You will need a processor in place to test. But since you've had this problem with two different boards I suspect the cpu.....unless somehow the cpu sockets got buggered on both boards.
    All I can say is try another cpu and/or look over the socket really well.
    Good luck.
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    did you try powering on the pc with front power switch and as soon as you hear the fans spin switch off at rear psu power switch? repeat this three or four times then let pc powerup normally,it should envoke the backup bios to recover the main bios chip

    try to do it as fast as you can
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  4. #4
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    Try with only 1 memory stick.
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    Hi all,

    Thank you so much for responding.

    I got a response back from Gigabyte, their response was that I would need an old Haswell CPU to bring up the system and flash the BIOS to the latest version. The i7-4790 needs the latest BIOS. So I do have an older i5-4430 on order. So I will test that out. Which does make sense. We'll see.

    I did try your other suggestions just in case.

    1 memory stick no difference - the behavior is still the same. 2 sticks, 1 stick (both individually), and 0 sticks. I would expect different results with 0 sticks (like beep codes or something)

    The rapid power on/off didn't do anything, but it's such a situational test I can't be sure I'm doing it the way you're suggesting. Just do it a few times and hope to get lucky. But still no luck.

    Again thanks so much for your suggestions all. I'll follow-up tomorrow when I get the new "old" CPU.

    Cheers!
    J.

  6. #6
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    Ahh. I didn't catch that you started out with one of the newer cpu's.
    But that makes sense now.....
    Hope it all comes together for you.
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    Yea, I did read the CPU supported list on their site and it is on there. With BIOS support since F4. Unfortunately I can't verify the BIOS version till I can boot it up. . . so crossing my fingers on that.

    Thanks again!

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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    Hi all,

    Just a follow-up.

    The problem came down to an old version of the BIOS that didn't support the new i7-4790 CPU.

    Unfortunately the fix is to use an older CPU (purchased an i5-4430) to get the mobo to boot to BIOS. And then use the efiflash.exe utility to update the BIOS to version F4. Then swapped CPUs to use the new i7-4790 which is now up and running.

    The original installed BIOS was version F2

    The new BIOS required for the new CPU is F4


    Cheers!
    J.

  9. #9
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    Quote Originally Posted by ScoobyJ View Post
    Hi all,

    Just a follow-up.

    The problem came down to an old version of the BIOS that didn't support the new i7-4790 CPU.

    Unfortunately the fix is to use an older CPU (purchased an i5-4430) to get the mobo to boot to BIOS. And then use the efiflash.exe utility to update the BIOS to version F4. Then swapped CPUs to use the new i7-4790 which is now up and running.

    The original installed BIOS was version F2

    The new BIOS required for the new CPU is F4


    Cheers!
    J.
    I'm sure Gigabyte would have done it for you, but of course you'd be out of a board for a while, depending on where you live.
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    Default Re: GA-Z87X-UD5 TH - Another Reboot Loop - could both BIOS be bad?

    I'm having the same issue as the author and unfortunately gigabytes CPU list is useless... So I was wondering if any knows if this processor would work with the older firmwares: <label class="product_title"> Intel Celeron G1830 2.8GHz LGA1150 Processor .
    Thanks,
    -Sharks
    </label>

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