Z97 Extreme6 Post Error 64
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=1199
Printed Date: 27 Dec 2024 at 6:47am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z97 Extreme6 Post Error 64
Posted By: rustybh1
Subject: Z97 Extreme6 Post Error 64
Date Posted: 10 Nov 2015 at 11:59am
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First of all here's my set-up:- MB - Z97 Extreme6 OS - Windows 10 64-Bit Bios - P2.50 CPU - Intel i7-4790K Cooler - NZXT Kraken X41 RAM - Corsair Vengeance Pro 32GB 1600MHz GPU - 2x EVGA Titan X PSU - AX1500i SSD - Samsung 840EVO 500GB My system has been totally stable since I built it back in April of this year. Apart from upgrading the GPU's in the summer, I've made no hardware changes and haven't installed any new software for a few weeks. I tried launching a game the other evening and the screen froze. The only option I had was to shut the PC down, but when I tried to reboot a few minutes later, I was stuck on a post screen with "64" showing on the MB. I've tried several attempts at the 10 hour CMOS clearing exercise, which on reboot gives me the option to load UEFI defaults by pressing F1, which just produces a blank screen (no MB post error though). I'm not one of the sensible people who keeps all the packing and extras, and I'm out of my 30 day return with Amazon, so does anyone have any suggestions? |
Replies:
Posted By: Xaltar
Date Posted: 10 Nov 2015 at 3:04pm
| Your board has dual BIOS, try switching to the second BIOS and seeing if that allows you to boot. If that still gives problems then you will want to try a different PSU with the system to rule out a failing power supply. You can also try removing everything from the system except 1 stick of RAM and CPU then see if you can boot off the iGPU. |
Posted By: rustybh1
Date Posted: 10 Nov 2015 at 3:54pm
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Good advice thanks - just tried with an older 850w psu, no difference, then followed that by removing both gpu's, sticks of ram and all the SATA connections except the one the OS is connected to. I have no access to the BIOS/UEFI setup screen, even with a PS2 keyboard and mouse so can't do anything with the BIOS setup. |
Posted By: Xaltar
Date Posted: 10 Nov 2015 at 3:58pm
| A bad SATA cable can cause the system to fail to post so I would disconnect your HDDs too and see if you can get into the UEFI. Have you tried the second BIOS yet? |
Posted By: rustybh1
Date Posted: 10 Nov 2015 at 11:25pm
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No, how do I do that? |
Posted By: Xaltar
Date Posted: 11 Nov 2015 at 1:34am
| At the bottom corner of your board near the reset and power buttons there is a little switch. Make sure you power down the system, remove the power cord then press the power button to discharge any residual power then once all the lights on the board are off and there is no power to the system at all flip the switch to its alternate position then power up the system again. |
Posted By: parsec
Date Posted: 11 Nov 2015 at 1:54am
Since you don't have the manual anymore (I'm guessing, although you can download it), this is the instructions for using and recovering the primary BIOS from the backup BIOS: ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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Posted By: rustybh1
Date Posted: 11 Nov 2015 at 2:48am
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Thanks, done all that. Now when I boot I get the ASRock post screen as I did before, but pressing F2 turns the screen blank and then 5 seconds later "B4" appears in the bottom right corner of the screen, with nothing else displayed. Also still have the 64 post error on the MoBo. |
Posted By: Xaltar
Date Posted: 11 Nov 2015 at 2:55am
| The error code on the Dr. Debug LED is probably b4 too and according to your manual that is a problem with a USB device. Try disconnecting all USB devices other than keyboard and see if that sorts you out ;) |
Posted By: rustybh1
Date Posted: 11 Nov 2015 at 3:02am
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OMFG!!!!! I'm such a dumbass!!! It must have been B4 all along and not 64!. THank you so much guys, and sorry for the newbie error. Now just have to work out which USB device is bad. Cheers |
Posted By: Xaltar
Date Posted: 11 Nov 2015 at 3:06am
Hope it sorts your issue  I once spent days trying to figure out a problem with my system not posting, I replaced RAM, PSU, CPU and tried a different GPU and finally replaced the mobo only to discover it was a bad SATA cable which caused the new mobo to not post either
 Always check the simple things first. |
Posted By: rustybh1
Date Posted: 11 Nov 2015 at 3:30am
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Thanks again. Just returned my PC to the EXACT same configuration it was in before and it boots no problem. Now that I know a '6' is actually a 'B' I should be good from now on. Thanks again |
Posted By: travers
Date Posted: 19 Mar 2019 at 8:13am
Holy hell Thanks for this |
rustybh1 wrote:Posted By: hootie976
Date Posted: 30 May 2020 at 12:04am
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I just had the exact same snafu. I thought it was 64 and couldn't figure out what was going on. B4 makes so much more sense. I forgot I had inserted an SD card into my USB SD card reader yesterday. Apparently my system was trying to boot from the card and freezing on B4. Thanks for the clarification @Xaltar ------------- Houston i7 9700K 5.1Ghz ASRock Z390 Taichi |