Mainboard / RAM settings question

[jmibk]

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-KR

How its connected (I followed the manual http://asrock.pc.cdn.bitgravity.com/Manual/X299%20Taichi%20XE.pdf):
- RAM in the x1 slots
- Harddrive in M2_1 slot
- Graphics card in PCIe1

What 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/type

Any suggestions, how the get rid of the problem?

[Chriss]

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

[PKTKS]

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 of
the 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 joint

Paul

[pcmad]

could be;
caps on motherboard
psu
cpu and or ram not seated problery

try also:

fixing above
clearing cmos
running memtest (it checks the ram)

[LateLesley]

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.