Clearing bios using jumpers is the only way my PC
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=4455
Printed Date: 23 Jul 2025 at 2:09am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Clearing bios using jumpers is the only way my PC
Posted By: elliotvm
Subject: Clearing bios using jumpers is the only way my PC
Date Posted: 21 Feb 2017 at 3:29am
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Asrock Z270 ITX/AC Intel i5 Big Shuriken 2 rev b
Fan starts spinning as soon as psu is turned on without pressing power button or touching pins. I have tried 2 different PSU's same problem Cannot manually start or shutdown pc either, have to do so via the back of psu. If I clear bios with jumpers before turning on PSU, I manage to reach bios where it recognises my ram sticks, cpu and fan. Can anyone help me understand/fix thanks |
Replies:
Posted By: Xaltar
Date Posted: 21 Feb 2017 at 3:49am
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Please list your full specs as well as making note of any old/reused parts. ------------- 
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Posted By: elliotvm
Date Posted: 21 Feb 2017 at 4:04am
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CPU: Intel Core i5-7600K 3.8GHz Quad-Core Processor CPU Cooler: Scythe BIG Shuriken 2 Rev. B 45.5 CFM Sleeve Bearing CPU Cooler Motherboard: ASRock Z270M-ITX/ac Mini ITX LGA1151 Motherboard Memory: Corsair Vengeance LPX 16GB (2 x 8GB) DDR4-2133 Memory Storage: Samsung 850 EVO-Series 250GB 2.5" Solid State Drive Video Card: EVGA GeForce GTX 1070 8GB SC GAMING ACX 3.0 Black Edition Video Card Power Supply: Corsair SF 600W 80+ Gold Certified Fully-Modular SFX Power Supply Also tried a g3 550W psu - same problem All new parts
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Posted By: Xaltar
Date Posted: 21 Feb 2017 at 4:30am
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" rel="nofollow - By what you describe it sounds like a short somewhere, either between the power switch and the board or under the board somewhere. Did you breadboard the system before assembling it in the case or just install it all? It may be worth pulling the board and trying to run it outside the case. -------------
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Posted By: parsec
Date Posted: 21 Feb 2017 at 9:11am
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" rel="nofollow - Assuming you have the Z270M-ITX/ac board, a Z270 ITX/AC board model does not exist. Adding to what Xaltar said, is the PC case new and what model? Did you check the connections to the System Panel header from the PC case? That would be the wires for the Power Switch, Power and HDD LEDs, and Reset switch? Is the polarity ( + and - ) correct? Did you check the power switch on the PC case, that it is working properly and not stuck in the "On" position? ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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Posted By: wardog
Date Posted: 21 Feb 2017 at 12:32pm
After reading that I'm assuming this is a new build. Please check the wiring coming from your case and attached/connected at the MB's System Panel Header. |
elliotvm wrote:Posted By: elliotvm
Date Posted: 21 Feb 2017 at 6:33pm
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Hello, yes it is the Z270M and a new build. I am currently breadboarded, as soon as I turn the PSU on via the switch at the back, my fan automatically starts running without me powering on the PC. I think my motherboard might be faulty as the PC wont shutdown via the pins
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