Z390 Phantom Gaming-ITX/ac not starting
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=11269
Printed Date: 07 Nov 2025 at 3:54pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z390 Phantom Gaming-ITX/ac not starting
Posted By: serj0k
Subject: Z390 Phantom Gaming-ITX/ac not starting
Date Posted: 08 Apr 2019 at 7:11pm
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Hi, I have Z390 Phantom Gaming-ITX/ac. When I turn-on PSU three red lights start 'breathing' at the bottom of the board. When I press the power button on the case nothing happens. CPU cooler is silent. No beep, nothing - just those red lights doing the same 'breathing'. I didn't attach GPU for the test run. I connected the case according to the PANEL1 in manual: [ ] [ ] [POW ] [RES ?²] [POW ?²] [RES ] [PLED-] [HD- ] [PLED+] [HD+ ] Is it a faulty motherboard? It does not have any error codes onboard and does not beep. |
Replies:
Posted By: Xaltar
Date Posted: 08 Apr 2019 at 8:22pm
 That is where the connectors go. If you still get no activity when you press the power button you can try shorting the pins (where the power button connects) and see if the system powers up. If it still will not power up, check for shorts under your board (it may be shorting on your case or case standoffs). ------------- 
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Posted By: serj0k
Date Posted: 09 Apr 2019 at 5:27pm
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Thanks, Xaltar I tried to move Reset connector upper, but still the same. Bottom of the motherboard does not touch the case, so probably I'll try to reassemble everything from scratch. But I believe it's a faulty motherboard because it doesn't beep or notify in any other way (all my previous motherboards had alerts for problems with cpu or ram) |
Posted By: RLGL
Date Posted: 09 Apr 2019 at 9:20pm
Do you have a speaker attached? they are not built in. ------------- Asrock Z370 Gaming K6,Intel i7 8700K, Asrock x570 Taichi |
serj0k wrote:Posted By: serj0k
Date Posted: 24 Apr 2019 at 8:38am
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Hi, I received my new case a few days ago and did another try to start this thing with the same results. I used a new case (it has only PWR and LED connectors) I tried clearing CMOS I tried starting without CPU and RAM I tried to start with CPU only I checked all CPU pins and re-installed CPU I removed CPU cooler backplate I tried to start with only one RAM module But this motherboard only blinks with three red LEDs and nothing else. Even CPU cooler does not spin. Even no beep sounds (I don't have an external speaker attached to this motherboard). Looks like I have to return this motherboard and pick some old good Gigabyte instead. |
Posted By: Dkone
Date Posted: 07 May 2019 at 4:25am
| Same situation with this mobo and i7-9700k. No post. Only fans are make one turn and nothing else. |
Posted By: The_Viking
Date Posted: 12 Sep 2019 at 11:35pm
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After 2 days whit fiddling whit this sh*t MotherBoard and X nr. of Clear CMOS, I used one of the NR.15 USB port to stick the USB stick whit the latest Bios on, and then I was able to Upgrade the BIOS.!  After that, windows 10 pro is on the way in as we speak. 
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Posted By: MikaelS
Date Posted: 13 Sep 2019 at 4:51pm
Would you mind sharing how to do that? I'm having the same issue as OP: i7-9700 Asus Geforce ROG Strix RTX 2070 Corsair Vengeance LPX DDR4-3200 When starting up, the mobo flashes red. Graphics card does nothing. CPU fan spins up and then stops. No display. After a short while, the whole system shuts down and then starts up again. This repeats itself. I'm completely lost on what to do from here. |
Posted By: CHnuschti
Date Posted: 14 Sep 2019 at 4:03am
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Sounds new to me, but might be an undocumented way to upgrade the bios. Go to the page https://www.asrock.com/MB/Intel/Z390%20Phantom%20Gaming-ITXac/index.asp#BIOS and download the "INSTANT FLASH" of newer version, you might try 4.00 first. Unpack the files and copy them to a USB Stick formatted with FAT32. Then plug the usb stick to one of those Nr. 15 as per manual USB ports and reboot. If it reboots automatically, just let it do this for quite a while, obvioulsy at some point in the reboot processes it possibly triggers an "automatic" attempt to update the bios from a usb stick. |
Posted By: GustavoC
Date Posted: 15 Sep 2019 at 8:59pm
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Is it possible there are problems with i7-9700 in combination with this board? I have exact the same problem. In the beginning it kept resetting the bios, so I had a chance to upgrade the bios. In the end, it wouldn't start up at all anymore. I've sent this board back for repair to the shop where I bought it. They said they fixed it. Interestingly enough, I could start it up again, used it a day or two. Now, as of today, the exact problem is back and I can't boot it up. It just starts up the fans, shuts down, and restarts... |
Posted By: GustavoC
Date Posted: 15 Sep 2019 at 9:43pm
Felt I needed to add something: I did get into windows regularly also after updating the bios. Could even run games properly and use my Valve Index VR kit like a charm. It just stopped working overnight today, just like it did a few weeks ago before I sent this card back. My setup: - Asrock Z390 PHANTOM GAMING-ITX/AC - i7-9700K with Scythe Mugen 5 PCGH Edition cooler - Corsair DDR4 Vengeance LPX 2x8GB 2666 - MSI GeForce RTX 2070 SUPER VENTUS OC - BitFenix Whisper BWG550M PSU |
Posted By: MikaelS
Date Posted: 16 Sep 2019 at 8:03pm
Thanks for this. I've given it a shot but without luck. The problem is that it never gets to POST, so there is no way it can detect the USB flash update. |
Posted By: Xaltar
Date Posted: 16 Sep 2019 at 8:34pm
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Get in touch with ASRock Tech Support. They should be able to advise you. https://event.asrock.com/tsd.asp -------------
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Posted By: MikaelS
Date Posted: 16 Sep 2019 at 8:57pm
Thanks Xaltar. I will give it a go. |
Posted By: tormyh
Date Posted: 08 Nov 2019 at 2:15am
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Hi. Did you get any reply from support? Got the exact same problem, nothing only red pulsing lights. Br. |
Posted By: MikaelS
Date Posted: 09 Nov 2019 at 10:35pm
Yes. It is the BIOS version. When I looked at the chip on the board, the small sticker said 1.03 (I believe). According to https://www.asrock.com/MB/Intel/Z390%20Phantom%20Gaming-ITXac/index.asp#CPU this board supports 9700 CPU since BIOS version P4.00. In order to upgrade the BIOS, the only solution provided by Asrock Support, was to install a Gen 8 CPU, update BIOS and then Ãnstall the Gen 9 CPU. I shipped the board to my retailer and they would do it for me (since I don't have a Gen 8 CPU). The board arrived yesterday but I haven't had a chance to test it yet. |
Posted By: tormyh
Date Posted: 09 Nov 2019 at 10:54pm
Thanks for your answer. My version 1.20 I think. but that wasnt an issue. The problem turns out to be a cable issue. Works great now. |
Posted By: MikaelS
Date Posted: 09 Nov 2019 at 10:56pm
Lucky you :-) Enjoy it, I hope it's worth the money :) |
Posted By: tormyh
Date Posted: 09 Nov 2019 at 11:22pm
Really happy with it so far, hope it lasts a long time :) |
Posted By: Klax
Date Posted: 13 Nov 2019 at 7:29pm
| I just powered on my system and have the same issue. However, I have bios version 4.00. Just sent a message to tech support. |
Posted By: owinfrey
Date Posted: 17 Dec 2019 at 10:28pm
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Today, I experienced the same issue with my computer. It powers on for 30 seconds and then restart, endless loop. I found the Bios to the issue with my ASRock z390 phantom gaming 4-CB (yes.. cyberpower). I don't have the means to downgrade the CPU from i7-9700kf to 8 series or the time, so here's what worked for me: Reset the motherboad CMOS 1. remove the GPU 2. locate the cmos battery and remove 3. find the cmos jumper and short for 20 secs. 4. replace the the battery 5. replace the gpu 6. turn on computer. It will start in Cmos 7. set the time and date, save and exit 8. System should reboot into the os Now you should be able to flash the bios. I hope this work for others... |