No video after ASRock Z370 Pro4 BIOS flash
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=9765
Printed Date: 11 Aug 2025 at 1:55pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: No video after ASRock Z370 Pro4 BIOS flash
Posted By: Bokkem
Subject: No video after ASRock Z370 Pro4 BIOS flash
Date Posted: 26 Sep 2018 at 4:28pm
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I downloaded BIOS 3.20 windows x64 version for my ASRock Z370 Pro4. My current BIOS version is 1.80 I restart the PC, but now my display does not power on and the screen stays black. Please advise how to proceed. Should I clear the CMOS by using the jumper on mainpcb? I use external PCIe Nvidia GTX 1080 GFX card with two LCD display connected to it (displayport). Should I connect a LCD screen to the onboard video connector to get video? I am very worried, but I hope you can advise me. I'm a skilled IT engineer. Before BIOS flash everything was working perfect. I flash BIOS because of CPU microcode update (Spectre/Meltdown security patch). BIOS flash process completed successfully. Problem started after reboot.
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Replies:
Posted By: Xaltar
Date Posted: 26 Sep 2018 at 4:32pm
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Disconnect the external GPU, clear CMOS and try power up again. Post back here if you still don't get POST. Good luck  ------------- 
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Posted By: Bokkem
Date Posted: 27 Sep 2018 at 1:20am
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As you suggested, I remove the GPU and connect one LCD to onboard HDMI port. I remove power cord and drain PSU by holding power button for 10sec. I place jumper on CLRCMOS1 and count to 10 again and remove the jumper. Connect the power and turn on PC. No screen. No keyboard (NUMLOCK does not light the led). No beeps. My power is running and the fans are spinning, I hear my DVD drive spin up, but no POST. The LAN port is showing a green power led and blinking amber data led. I connect LCD to VGA port, same. Now I die a little bit inside.  Next I power down and follow instructions from Asrock techsupport as received by email. Removed all USB, LAN and all SATA and M.2 drives. Again I clear the CMOS and boot: No screen. No beeps. Again I put the jumper on the CLRCMOS1, I remove CMOS battery, although I know already it's not a faulty BIOS setting. I place CMOS battery back after 15 minutes and remove the jumper and power on. Same. I cannot believe it. For the first time in 30 years working with PC my worst nightmare comes true: a BIOS flash bricked a totally fine PC. I cannot understand why. I flashed hundreds of BIOS, I have done nothing wrong. Why did this happen?
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Posted By: RLGL
Date Posted: 27 Sep 2018 at 2:38am
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" rel="nofollow - Did you flash from windoze or with instant flash? ------------- Asrock Z370 Gaming K6,Intel i7 8700K, Asrock x570 Taichi |
Posted By: Bokkem
Date Posted: 27 Sep 2018 at 2:47am
| From Windows 10 x64 latest build |
Posted By: Xaltar
Date Posted: 27 Sep 2018 at 2:53am
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Unfortunately it happens sometimes, it's one of the reasons I don't recommend windows flash utilities, it just adds more variables that could cause a bad flash. I always use instant flash from within the UEFI, just to be as safe as possible. All you can do now is send in the board to be repaired/replaced, it should still be under warranty. You can start the process with ASRock Tech Support or your place of purchase. The only other alternative is a ROM programmer with the right clamp for your BIOS chip. Unfortunately your board does not seem to have a socketed BIOS chip so getting a replacement BIOS ROM isn't an option. Either way, I am sorry that it didn't work out for you and good luck getting it fixed -------------
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Posted By: Animalm4st3r
Date Posted: 27 Sep 2018 at 7:17am
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" rel="nofollow - you tried using the IGPU? |
Posted By: Bokkem
Date Posted: 01 Oct 2018 at 11:24pm
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Today I went to the EU HQ Office of ASRock where they checked the UEFI status. It had debug code 99 (Initialize BIOS data area) and confirmed the issue. The support engineer flashed the UEFI using the connector on the board and resolved the issue just when I finished my coffee in their canteen. The RAID0 set was undamaged, everything is restored. I'm very satisfied by the excellent support from ASRock. Next time I rather use the Instant Flash [F6] and run a back-up before I do, just in case. Thank you all for your advise.
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Posted By: Xaltar
Date Posted: 02 Oct 2018 at 12:28am
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That is fantastic to hear. Enjoy your system -------------
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