PC won't boot, fans on, motherboard leds off
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=18503
Printed Date: 27 Jul 2025 at 5:59pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: PC won't boot, fans on, motherboard leds off
Posted By: grilomoto
Subject: PC won't boot, fans on, motherboard leds off
Date Posted: 30 Mar 2021 at 5:27pm
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When I press the power button (both the one on the case and the one on the motherboard) nothing turns on. Then I press it multiple times, eventually the following happen: Sometimes the leds(on the cooler/fans/GPU) and the fans will turn on and off repeatedly and then, eventually, turn off for good. But not the leds on the motherboard, those will remain off (by leds on the motherboard I mean: the bios, Dr. debug, and the lights on the reset and power button that are on the motherboard). Other times the leds (on the cooler/fans/GPU) and the fans will turn on and stay on but I won't get any display, and the leds on the motherboard will remain off as well. In either case the restart and the power button wont work,, except pressing and holding the power button to turn the PC off. So I keep trying to turn the PC on, and eventually the lights on the motherboard will turn on, and whenever they do, the PC starts normally. When it starts it works normally. I even ran a benchmark on it to stress test it, and it ran fine. And I can even restart it with no problem. Specs: motherboard: ASRock Fatal1ty X99X Killer cpu: i7 5820k GPU: RTX 2060 ram: 7x4Gb kingston DDR4 SSD: 2x120GB kingston SSD and one NVMe XPG SPECTRIX 512GB Recent changes: I added the NVMe a year ago, the GPU 6 months ago and 1 ram stick died (the PC just started showing less ram) a month ago... and after the ram died and I took it out, the pc started having this problem. I already ran memtest, and the remaining ram show no problems. I also already took out all of the memory, the GPU and the NVMe and reinstalled them. And I changed the CMOS battery and used the button to reset it that the motherboard has (sometimes using this button will lead to the PC finally booting). So, does anyone know what the problem with my PC could be£ can anyone help£ |
Replies:
Posted By: Xaltar
Date Posted: 30 Mar 2021 at 7:04pm
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Any time a previously working system stops POSTing after being fine for a prolonged period the first thing to try is another PSU. They have a habit of degrading over time, particularly cheaper ones. ------------- 
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Posted By: grilomoto
Date Posted: 30 Mar 2021 at 7:29pm
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thank you for the reply sorry, forgot to say the PSU: Corsair 650W 80 Plus Bronze what does POSTing mean£ is the lights on the motherboard not turning on a POSTing problem£ is there a way to know if it is rely the PSU that is malfunctioning before I buy a new one£ also, if it is the PSU wouldn't the system present any problem while it is on£ I mean, after I manage to turn it on there is no problem at all... |
Posted By: Xaltar
Date Posted: 30 Mar 2021 at 9:32pm
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Your issue could be caused by the PSU not providing enough power to allow the system to POST (Power On Self Test) when it's cold. The POST process begins when your Dr. Debug LED show's its first code and ends when the POST screen disappears and the system begins to boot into the OS. A dying PSU will often exhibit this symptom. Once you have been trying for a while and the components have warmed up, suddenly the system will come to life. This is a tell tale indicator of dead/dying capacitors inside the unit. The number of symptoms caused by a failing PSU are staggering. It could be anything from the system simply not powering up at all (obvious) to random blue screens when gaming and random shut downs when you connect a USB device etc. Your issue may not be the PSU at all but in my experience, issues like this very often (but not always) are caused by a bad PSU. It's simply the most likely culprit. The best option would be to try and borrow a good PSU to test with. If it resolves the issue, buy a new one. If not, post back here again. Given your Corsair unit is their budget model and I am guessing you have been using it for at lest 2 - 3 years, it is very likely the issue. -------------
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Posted By: grilomoto
Date Posted: 01 Apr 2021 at 12:53am
I have been using it for 7 years...
Ok, I'll do that, thank you. |
Xaltar wrote:Posted By: Xaltar
Date Posted: 01 Apr 2021 at 1:13am
Good luck. 7 years, that was a great investment  I always go over the top on my PSUs. My current 1000w 80+ Platinum unit has been going strong for almost 8 years now with no signs of degrading. When I calculate how many budget PSUs I likely would have gone through in that time, typically 1 every 2 upgrades, I come out to way more than I spent on this one. -------------
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