Black Screen in Windows after Restart
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=113285
Printed Date: 23 Sep 2025 at 8:51am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Black Screen in Windows after Restart
Posted By: Rocky9
Subject: Black Screen in Windows after Restart
Date Posted: 07 Aug 2025 at 6:29pm
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Subject: Black Screen Of Death on Reboot and Unable to Update BIOS I am having two issues with a B860M-H2, Ultra 225F, 32GB DDR5 ram. The first is that Windows 11 has been installed successfully but on each restart it will Black Screen of Death (windows will run but the screen goes blank due to no signal). The second is that I am unable to update the BIOS to any version other than the one installed (1.12) Can I add that I am no newbie and I understand about memory training, discharging capacitors, checking and changing cables etc. I have had similar problems to the above over the years but they have all been resolved and this one has not yet! Windows BlkSOD Windows 11 installed successfully. When I restart (or shutdown and power up sometime later) the screen will go off a few seconds later. I know Windows is running because the HDD (970 Evo Plus) red light flashes on the case. All the fans are on, and the keyboard caps lock light is toggleable. Although I try Alt-F4-Enter to shutdown but it does not do that. The only way I can 'get a screen back' is to shutdown (hold power button for 5 seconds), turn off PSU, and then clear the CMOS via the jumpers. I discharge the caps by holding down the power button and then I power up ... I can now get back into the BIOS screen but if I then restart (with our without changing any settings) something different happens... No POST This is now different. What happens is that the PC restarts, all the fans come on for about 3 seconds and then clunk - off. Everything turns of for 1 second and then the CPU fan and AIO pump turn on but the case fan stays off. There is no power to the USB devices (no caps lock light). Remove Disk To ensure Windows is not doing anything here I remove the 970 and try again. Exactly the same happens. On power on there is 'full fans' for about 3 seconds, and then the CPU and AIO pump go half speed, the Case fan turns off. Nothing - no screen, no POST, no splash screen nothing. The only way out of this is to reset the CMOS via the jumper. I can do that ... get into the BIOS, I can change things or leave alone (usually I restore factory BIOS settings) but after a reboot or two I get this no POST. Updating BIOS Next I try a BIOS update. The onboard version is 1.12 so I try 1.14 and the 2.03 Beta. But both fail. Flashback fails because it does the solid green light thing. I power off, insert USB stick in the Flash socket, press the button, flashes a few times then goes solid. I try all USB sockets to no avail. Insta Flash part works (note I have done this via F2 and the F6 shortcut method). If I try to flash 1.14 or 2.03 it gets to 10% and then says 'After pressing enter the system will restart...' which is a fail because it does not say Success. The only BIOS I can successfully update is the one I currently have. 1.12 works but not the others. I am really stuck with this. I don't know if the combination of components do not work (the CPU, Memory, NVME are all on the QVL) or if it's the GFX (don't have a spare to hand) the PSU (BeQuiet Pure Power 11 600W) or anything else with the case (have removed all devices and jumpers apart from the power switch). ------------- B860M-H2 Ultra 5 225F 2x 16GB Corsair Vengeance Black PC-56000 (7000) Cas 40, XMP 3.0, 1.4V MSI Mag Coreliquid A13 240 Sapphire RX 6600 XT Samsung 970 Evo Plus 250GB |
Replies:
Posted By: Xaltar
Date Posted: 07 Aug 2025 at 11:34pm
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Have you tried a different display output from your GPU? Most often issues like this (black screen) are because the display output is being sent to a different display output to the one you are using. ------------- 
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Posted By: Rocky9
Date Posted: 08 Aug 2025 at 6:58am
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It seems to have settled down now. The windows issue has gone and BIOS changes are holding up. I removed the CMOS battery and totally dismantled and rebuilt the rig. However, I still can not flash to anything other than the version that is currently installed. The fact that I can flash 1.12 proves that the USB memory stick is fine, so maybe it's a corrupted file with 1.14 and 2.03? I am downloading the Global file only. Have not tried the Chinese link. ------------- B860M-H2 Ultra 5 225F 2x 16GB Corsair Vengeance Black PC-56000 (7000) Cas 40, XMP 3.0, 1.4V MSI Mag Coreliquid A13 240 Sapphire RX 6600 XT Samsung 970 Evo Plus 250GB |
Posted By: Rocky9
Date Posted: 14 Aug 2025 at 6:38pm
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Spoke too soon. I had it working for a couple of days and now it's gone again. When I turn on from cold, or from warm reboot there is no POST - no screen, no motherboard beep, nothing. As no screen is half the issue I will have to purchase a non F CPU. Having no onboard gfx makes things tricky to diagnose so forget this issue for now. I will report back with the new CPU. Unable To Flash to Newer Bios But what about the BIOS update failing? Why can I not run the BIOS flash tool for anything other than 1.12? re: I put 1.14 or 2.03 (Beta) on a flash drive and it starts to run. When it gets to 10% it says it will reboot but then never updates. ------------- B860M-H2 Ultra 5 225F 2x 16GB Corsair Vengeance Black PC-56000 (7000) Cas 40, XMP 3.0, 1.4V MSI Mag Coreliquid A13 240 Sapphire RX 6600 XT Samsung 970 Evo Plus 250GB |
Posted By: Rocky9
Date Posted: 15 Aug 2025 at 5:26pm
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Update: I swapped the CPU for a Ultra 7 265K and I now have success. I plug monitor into to the onboard HDMI port and get POST. Next I try flashing the BIOS ... and this is successful. Note: With this motherboard you can't flash the BIOS with an F series CPU. When you are in the BIOS it gets to 10% ... and then reboots. The BIOS update routine then calls for the onboard gfx in order to complete the other 90% but the F series does not have onboard gfx leaving the setup in limbo. Which leads to the question why did Instant Flash not work? Instant Flash "allows users to easily update the BIOS without needing a compatible CPU". It would not work with my B860M-H2 and Core Ultra 5 225F. ------------- B860M-H2 Ultra 5 225F 2x 16GB Corsair Vengeance Black PC-56000 (7000) Cas 40, XMP 3.0, 1.4V MSI Mag Coreliquid A13 240 Sapphire RX 6600 XT Samsung 970 Evo Plus 250GB |
Posted By: Xaltar
Date Posted: 15 Aug 2025 at 11:14pm
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It sounds like the 225F CPU was defective or not seated in the socket properly. There is no other reason the BIOS update would cancel out. Thanks for sharing your info. If you still have the 225F it may be worth looking at RMAing it as it may have been the cause of all your issues from the start. The fact that the new CPU resolved your other issues as well as the update issue would strongly suggest the CPU was the culprit. I am glad to hear your system is now running as it should, enjoy it  -------------
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