X99M Fatality-no cpu-what should light up?
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=2717
Printed Date: 08 Jan 2025 at 6:42pm
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Topic: X99M Fatality-no cpu-what should light up?
Posted By: davaz
Subject: X99M Fatality-no cpu-what should light up?
Date Posted: 24 May 2016 at 1:46am
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Hi 1st time posting here, wish was not with less knowledge and a potential problem, but just need someone to help. I have purchased a second hand x99m fatality and currently i have no cpu to test it. My question is: if i just plug in the atx 24pin and turn psu on, what should happen with this board. Will i get any lights at all? I want to know if the mobo is working before i open a case on ebay, just to make sure its not me, i got a good deal on it also. Currently the only thing that lights up is the Killer lan port, and will light up once upon psu power, but blink continually when connected to the router. Pressing the onboard power does nothing and is not lit. Does this need a cpu to function and light up? Does the debug led also need a cpu to light and show a code? Thanks for any help given here, im hoping this is just my naivety and that the mobo deos work. David
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Replies:
Posted By: Xaltar
Date Posted: 24 May 2016 at 2:12am
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That is perfectly normal behavior, the only thing that should light up is the LAN port if there is a cable connected to both it and another device. The board will not power on without a CPU installed. ------------- 
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Posted By: davaz
Date Posted: 24 May 2016 at 2:21am
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Thanks for your reply. So no MB power led, no power/reset button light up, no debug led without cpu. That's all normal? Sorry bit knew to this kinda problem solving... but how come there are cpu error debug codes in the manual? Is that if even if the cpu's failed and dead? it still creates a circuit for the mobo to show the debug cpu code?! Thanks for your help. |
Posted By: Xaltar
Date Posted: 24 May 2016 at 2:30am
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To the best of my knowledge there is probably a circuit on the socket that requires the CPU to close and allow any kind of power up. The same is true of all my ASRock intel based motherboards. No CPU, no power or LEDs or any other indicators other than the LAN port. -------------
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Posted By: davaz
Date Posted: 24 May 2016 at 2:39am
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Ok cool, i feel more confident about it now. I'll just go ahead and buy a cpu,and well, hope all goes well. Thanks :)
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Posted By: Xaltar
Date Posted: 24 May 2016 at 2:46am
If the LAN port is lighting up then that is a good sign. Is there any particular reason you were concerned or was it just that you could not power on the system without a CPU that was worrying you? If it was only the inability to power the system on then you have no reason for concern  -------------
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Posted By: parsec
Date Posted: 24 May 2016 at 12:03pm
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Xaltar, IMO the main reason the OP was concerned, if at all, was because the board is second hand according to his first post. davaz, I notice you did not say you connected the 4/8 pin 12V ATX CPU power cable to the board in your first post. Be sure to do that once you get a CPU, otherwise the CPU will not work. Any time power has been removed from an ASRock board, which can simply be the PSU switch is set to Off and the AC power disconnected, when AC power is reconnected and the PSU switch is set to On, you won't see any of the LEDs on the board light up. That happens because the board has not been fully powered up yet, and is not yet in one of the ACPI power states. Even when you do a Windows Shutdown, with the PSU on as we normally do, the board is in the S5 power state. The board is more "alive" in that situation than when power is first applied to the board after power has been completely removed. ------------- http://valid.x86.fr/48rujh" rel="nofollow"> 
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