Mainboard / RAM settings question - Page 1
Forum section: electronics / repair

author: jmibk
author_rank: Regular Contributor
timestamp: August 17, 2019, 10:12:45 am
content: I want to built up a media server with some hardware parts. Since the beginning (12-2018) there was the issue, that if I connect power to the system and try to power it up, no image apears and this 7 segement thingy on the mainboard shows "15".Errors can be found here:https://www.asrock.com/support/faq.asp?id=334.The strange thing: if I unplug power, wait for 10 secs, plug it back in and push the power button, sometimes it boots up. That can be necessary 1 to 10 times.That behavior vanishes, during the time the power supply stays connected with the mains. You can reboot und shut down the system as often you want - you can boot it every time without problems.The problems start by unplugging the power for some seconds.What components are in the system (that causes this error). I left everything away that is not absolutely neccessary to boot up:- Mainboard: ASRock Taichi 399 XE- CPU: Intel Core i7-7820X (because the 28 PCI lanes)- Powersupply: EVGA 1000 GQ, 80+ GOLD 1000W, 210-GQ-1000-V2- RAM Memory: GSkill F4-3200C16Q-32GTZB- NV Harddisk: Samsung MZ-V7P512BW 970 PRO 512GB- Graphics Card: EVGA GeForce GTX 1080 Ti SC Black Edition, 11G-P4-6393-KRHow its connected (I followed the manualhttp://asrock.pc.cdn.bitgravity.com/Manual/X299%20Taichi%20XE.pdf):- RAM in the x1 slots- Harddrive in M2_1 slot- Graphics card in PCIe1What I tried:- using only one RAM module in different slots => no change (with and withour bios reset)- trying some fixed memory clock rates in bios settings => no change (tried these printed on the memory, the fastest that is supported by the cpu, the fastest that is supported by the board, some random numbers that are smaller than the maximum speeds)Whats worth to try:- new bios firmware upgrade- try another RAM memory brand/typeAny suggestions, how the get rid of the problem?

author: Chriss
author_rank: Frequent Contributor
timestamp: August 17, 2019, 10:18:16 am
content: Do you tried to use another psu?I'm afraid does there are some capacitors out of spec on the MB or PSU.Sent from my SM-J500F using Tapatalk

author: PKTKS
author_rank: Super Contributor
timestamp: August 17, 2019, 11:53:55 am
content: Please this a very long shot ballpark guess....**IF your MOBO is AMI, the POST CODE 15 locks just after memory detection phase.Your list of things relate much like a "COLD JOINT" in some part ofthe Super I/O power transition control ( from ACPI states S0/S3/S5)Once "COLD" the board fails to change state.Once "WARM" you don't need to check some particular signal states.A schematic will be essential to evaluate the possible COLD jointPaul

author: pcmad
author_rank: Regular Contributor
timestamp: September 02, 2019, 07:52:21 pm
content: could be;caps on motherboardpsucpu and or ram not seated problerytry also:fixing aboveclearing cmosrunning memtest (it checks the ram)

author: LateLesley
author_rank: Frequent Contributor
timestamp: September 03, 2019, 02:14:31 am
content: As it's a problem of cold booting, after a power off, I'd be checking the BIOS battery is good as a first step. Second, if you have upgraded the BIOS firmware, clear the BIOS with the jumper, then re-enter all the settings. I've had times where boards acted funny after an upgrade, and a BIOS reset fixed it. If you have mixed speed RAM modules, put the slowest in the first DIMM slot. Many boards will use that one to set the RAM timings, unless you set them manually. Also check that the 24 pin power connector is connected properly, as this is where the RAM gets it's power from.