Question about Z390

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   Hi, I registered to ask a question about a z390 motherboard. Thanks for your help.

Edited by Xaltar - 02 Aug 2025 at 4:34pm

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ts55dlx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Aug 2025 Status: Offline Points: 90	Post Options Post Reply Quote ts55dlx Report Post Thanks(0) Quote Reply Topic: Question about Z390 Posted: 02 Aug 2025 at 4:11am
	Hi, I registered to ask a question about a z390 motherboard. Thanks for your help. Edited by Xaltar - 02 Aug 2025 at 4:34pm

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Online Points: 27848	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 02 Aug 2025 at 4:34pm
	Fire away


ts55dlx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Aug 2025 Status: Offline Points: 90	Post Options Post Reply Quote ts55dlx Report Post Thanks(0) Quote Reply Posted: Yesterday at 1:30am
	Hi Thanks. I have an older z390 phantom gaming itx/ac I built years ago. Specs I7 9700 3.6 970 evo 1 tb installed in M1 P.430 bios Corsar 16 gb x 2 windows 11 pro 64 bit 850 watt ps No other components installed The issue, in 2021 I bought this card MSI Gaming GeForce RTX 3060 12GB 15 Gbps GDRR6 192-Bit HDMI/DP PCIe 4 Torx Twin Fan Ampere OC Graphics Card When the card was install (with power to card) the motherboard lights were on but it would not power up at all no fans ext...if the card was removed it would boot normally. I ended up returning the card because i thought it was doa. After that I never tried a gpu again. Fast forward I gave the computer to my daughter for her gaming fun (faster than her laptop) she really wanted a graphics card so I thought I would try again. I have a EGVA geforce GTX 1060 6 gb that is known working. I installed it and have the same issue as before. I tried... resetting the bios Verifying that pci first for gpu is selected iun bios Adjusted version speed settings from auto thru 3 card installed properly and latched Correct power cable to card Looked at windows device manager, all drivers installed and show working pci Tested a fire wire pci card I have, system boots fine with it installed She bought this card with her money (she is 15) so im really hoping I can get this working some how, I have searched for hours and found many with similar issues but no fix Thanks so much for your time

ts55dlx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Aug 2025 Status: Offline Points: 90	Post Options Post Reply Quote ts55dlx Report Post Thanks(0) Quote Reply Posted: Yesterday at 1:32am
	I should make clear, when I said it would not power up I meant the entire pc

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Online Points: 27848	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 19 hours 60 minutes ago at 6:44am
	What PSU are you using? Generally speaking if a system fails to turn on at all when a power hungry component is added the PSU is high on the list of possible causes. It wouldn't happen to be a BeQuiet 850w PSU would it? The reason I ask is because I have seen a large number of people having issues with BeQuiet PSUs. Many of their units are dual rail, in essence you can think of it as 2 smaller PSUs in one and they then combine the ratings of said units for the total. In other words, a 500w dual rail PSU typically consists of 2 x 250w 12v rails. If your GPU requires say 300w of power then the PSU simply won't turn on because it triggers an over current protection. This is an oversimplification but illustrates the issue. With an 850w unit it shouldn't matter if it's dual rail as each should be in excess of 400w. However, if you are powering everything of a single rail it could be too much for it. If you don't have a BeQuiet PSU you can still check to see if your PSU is listed as having 2 x 12v rails, it will be in it's specs, either on the sticker on the unit itself or on it's product page. It will say something like 5v - A 3v - A 12v1 - 36A 12v2 - 40A If your PSU is a single rail unit (typical for most consumer and gaming PSUs) then it may be faulty. If you have another PSU you can test with, give it a shot, post back here if it doesn't work and I will try walk you through some more complex troubleshooting.


ts55dlx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Aug 2025 Status: Offline Points: 90	Post Options Post Reply Quote ts55dlx Report Post Thanks(0) Quote Reply Posted: 16 hours 35 minutes ago at 10:09am
	Thanks for the follow up! The PSU is a Seasonic focus px 850. Specs say its a single 12 volt rail good for 70 amps. I haven't done any multi meter or current testing but can if necessary. I dont have a spare PSU but should be able to test this one with the proper info. Interesting observation, so I started the pc with the gpu installed but no power cable to it. the system fans come on and run, the gpu fan and comes on for about 30 seconds then shuts off. So it appears to only not turn on when the power is connected to the PSU. According to the documentation this power supply has a 10 year warranty but I imagine I would need to prove its the unit first. I have limited time today but I think we are on the right track. Any further advice or thoughts are appreciated

ts55dlx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Aug 2025 Status: Offline Points: 90	Post Options Post Reply Quote ts55dlx Report Post Thanks(0) Quote Reply Posted: 15 hours 51 minutes ago at 10:53am
	Up till now I only got it to start after removing the card. I tried to start it with power connected to confirm no start. I then unplugged the power from the gpu and still no start. I left the gpu in this time and turned off the power switch for two minutes and tried to start again without power hooked up. The fans again come on. From documentation it appears the PSU if it "detects a problem" it will not supply power which appears to be whats happening...then after turning it off it resets. Your thoughts are again appreciated! Then next step my be contacting seasonic...unfortunately I dont think I still have the receipt for its purchase back in 2019.

ts55dlx Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 Aug 2025 Status: Offline Points: 90	Post Options Post Reply Quote ts55dlx Report Post Thanks(0) Quote Reply Posted: 14 hours 36 minutes ago at 12:08pm
	So the 8 to 6+2 pin cable is labeled VGA ??...trying to decipher this had been challenging but I think the cable may be the problem (wired wrong) https://seasonic.com/wp-content/uploads/2024/09/Seasonic-PSU-Pinouts-V2-Large-scaled.jpg although this isn't a perfect match..I will see if I can find another cable to try. Are all pcie cables wired the same? (like an industry STD) Thanks

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Online Points: 27848	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 11 hours 49 minutes ago at 2:55pm
	Yes, PCIe power (GPUs) is a 6+2 pin connector. CPU power is a 4+4 pin connector and has a different pinout. They are keyed differently but because the plastic is fairly soft it is possible to force the wrong cable into the wrong connector. If you connect a CPU (4+4) power cable to the GPU (or a 6+2 to the motherboard) the system will not power on. This now triggers short protection. Sorry, I should have thought of that in my last post.