PC won't boot unless unplugged first
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=25444
Printed Date: 28 Apr 2024 at 3:02am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: PC won't boot unless unplugged first
Posted By: user123321
Subject: PC won't boot unless unplugged first
Date Posted: 07 Feb 2023 at 4:56am
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I recently built 2 systems, both with an A520M-ITX/ac. They both run fine and fast. The only issue is booting. Both pc's won't boot, unless I unplug them first, hold the power button a few seconds to discharge, plug back in and then hit the on button. I tried googling and playing around with the bios settings, but with no success. Any idea what could be causing this, or how to solve it? Any help is much appreciated. A520M-ITX/ac Ryzen 5 5600G Kingston Fury Beast KF436C17BBK2/16 WD Blue SN570, 2 TB SSD HDPLEX 250 GaN https://hdplex.com/hdplex-fanless-250w-gan-aio-atx-psu.html" rel="nofollow - https://hdplex.com/hdplex-fanless-250w-gan-aio-atx-psu.html I'm using grounded sockets |
Replies:
Posted By: ozorfis
Date Posted: 08 Feb 2023 at 12:18am
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I would guess at a RAM issue: - Bios update - lowering ram clocks, increasing voltage - reseating RAM and CPU (unlikely as both systems are affected) |
Posted By: user123321
Date Posted: 08 Feb 2023 at 6:15am
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Thanks for the suggestions! I'm running the latest bios and tried lowered ram clocks, unfortunately without success. Just to be clear: the pc show's no signs of life whatsoever when I press the power button, the fans don't spin up. However, when i unplug and then hold the power button, after 7 secs the fans spin up just a tiny bit for a split second. And there-after when I plug it in, it boots just fine. |
Posted By: ozorfis
Date Posted: 08 Feb 2023 at 6:42am
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So the psu has to be discharged completely for it to power up. After the drain and replugging it, if one waits too long, will it also not boot? No sign of life sounds more like a power issue. MB or PSU - but still strange that both systems are affected. I would check the PSU with a jumper and multimeter to see, if it will deliver power in any case. Then I might check, if the pins from the ATX MB connector to the power button have continuity - maybe try starting the machine by shorting the pins on the pin header. |
Posted By: Xaltar
Date Posted: 08 Feb 2023 at 7:43am
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If you are using a single stick of RAM, what slot do you have it in? If it's in slot A1 that could be causing the issue. Modern boards don't like using channel 1 when no other RAM is installed. You want your RAM installed in the socket furthest from the CPU. Hope this helps. ------------- 
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Posted By: eccential
Date Posted: 08 Feb 2023 at 10:22pm
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I'm a bit surprised that no one pointed out that HDPLEX 250 GaN is a non-standard power supply. I'm not saying that is causing the problem, but since TWO systems are behaving the same weird way, you'd want to consider anything that are the same for the two systems, beyond just the motherboard. Having wrote that, I've used Mini-Box power supplies like various PicoPSU's, M3-ATX, and M4-ATX to great success. Note, A520M-ITX/ac motherboard manual specifically points out that USB_12 ports (two USB2.0 ports above the PS/2 connector) are powered by +5VSB (Stand-By), rather than +5VDUAL. This is somewhat unusual, as I've not found this statement in manuals for other Asrock motherboards I own. And I own like 6 different Asrock AM4 motherboard models, including one A520-ITX/ac. So if stuff is plugged into those ports, maybe try different USB ports? I know it's a long shot. |
Posted By: user123321
Date Posted: 22 Apr 2023 at 7:48pm
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The issue has (finally) been resolved! Culprit was the PSU. The manufacturer has provided me with PSU's of a new batch, that don't have this issue. |