B450 Pro4 won't POST
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=14297
Printed Date: 09 Aug 2025 at 1:54pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B450 Pro4 won't POST
Posted By: vilebushes
Subject: B450 Pro4 won't POST
Date Posted: 06 May 2020 at 4:52pm
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Specs: ASRock B450 Pro4 AMD Ryzen 7 2700X Crucial Ballistix Sport LT 16GB Nvidia GeForce GTX 1050 Some 550w PSU Hello, everyone. I just have finished building my new system and, strangely, if I use the video card in the top x16 PCI-E slot the system won't even POST - black screen, no beeps, but fans are spinning. The same video card works just fine in the bottom x4 slot and it worked without any trouble in my older system. Does anyone have any idea what is wrong with my computer? |
Replies:
Posted By: datonyb
Date Posted: 06 May 2020 at 10:29pm
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i would hazard a guess you have an adapter plugged in the gpu dvi-vga or hdmi - dvi etc etc you should find hdmi to hdmi on monitor works fine (the problem seems to be with ADAPTERS the GPU bios isnt sending correct info to the boards bios to start the boot, this is bypassed using x4 slot) ------------- [url=https://valid.x86.fr/jpg250]  [/url]3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold |
Posted By: vilebushes
Date Posted: 07 May 2020 at 6:15am
I'm using HDMI-HDMI so, unfortunately, that's not the case. Also, I've tested an old GeForce 9600 (DVI-VGA) and it's working without issues in the x16 slot. |
datonyb wrote:Posted By: datonyb
Date Posted: 07 May 2020 at 10:18pm
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find the option in bios for 'pcie gen' if its set to 'auto' turn it to 'gen3' you may also see pcie speed option, if thats set to 'auto' turn it to say '1 x 16' ------------- [url=https://valid.x86.fr/jpg250] [/url]3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold |
Posted By: vilebushes
Date Posted: 10 May 2020 at 10:05am
I've tried every combination of Gen1-3 and 1x16, 2x8 and still no luck. :( |
Posted By: datonyb
Date Posted: 11 May 2020 at 1:27am
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try turning off FAST BOOT if its not already set CSM mode ------------- [url=https://valid.x86.fr/jpg250] [/url]3800X, powercolor reddevil vega64, gskill tridentz3866, taichix370, evga750watt gold |
Posted By: vilebushes
Date Posted: 11 May 2020 at 8:21pm
| CSM is enabled and Fast boot is off by default settings. |
Posted By: Vulpie05
Date Posted: 25 May 2020 at 2:53am
| I forget the exact setting, but do you have the display set to internal or external graphics? Is your display on the mobo hdmi port, or one on the gpu? |
Posted By: ThreeDee
Date Posted: 25 May 2020 at 11:51pm
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One thing to check is that your card is seated properly in that top slot .. if your case is a smidge wonky .. sometimes it's hard to get the video card to get all the way seated. ..alternatively .. take components out of case and see if system boots with video card plugged into x16 pcie slot .. check for contaminates inside of slot as well .. piece of paper, packing material .. etc .. ------------- |Ryzen 5 5900|ASRock X570 Taichi-BIOS 4.60|2x16GB HyperX Predator RGB 3200@3600 1:1 IF|ASRock RX 6700XT|2 x PCIe 4.0 M.2 Drives for OS & Games|850 WTT Seasonic 80+ Titanium PSU|Noctua NH-D15| |