Strange no-boot issue

[Lars95]

My relevant parts are:

2x 8GB HyperX Fury DDR4 RAM,

2x MSI GamingX 1070’s (SLIHB Bridge),

MSI Z370 Gaming Pro Carbon motherboard,

Intel i7 8700k

Samsung 950 Pro 512GB M.2 NVME Drive

850w Corsair PSU

 

I’ve been having this strange issue with my pc now for a while. It seems more likely to happen after switching monitor outputs from DP to HDMI, but not always.

I’ll press the power button, the PSU will give the usual startup click, fans will spin up, but the MBs integrated backlight will not light up before a couple of seconds. The pc won’t boot or post. The SLI HB bridge does not light up, nor does any peripherals except the keyboard. On the motherboard the “CPU” light lights up to indicate a cpu related issue. 

 

Now, I’ve tried to troubleshoot this quite a lot. I’ve tried only one GPU, no GPU, one stick of RAM, different slots with the RAM, reseat the CPU, adjusting mounting pressure on motherboard (I even replaced my dark rock pro 3 because I thought it might’ve been too heavy on the MB), reset CMOS, remove BIOS battery, cycle power, different display outputs and cables. Nothing works. Only thing that seems to somewhat work is to turn off the PSU, drain all residual power and leave it for many hours. Then it’ll sometimes start like nothing happened 

 

I don’t know what to do, this has been going on for a year and I cannot find a solution, nor can anyone I know. I’ve updates the bios firmware and all firmware and drivers are up to date. It’s really frustrating when I need or want to use my PC and it acts like a moody car on a cold day. 

 

Anyone have any ideas of what this can be or how to solve it? 

[Valkyrie Lenneth]

i used to have with a maximus vi hero board that if i had my phone connected in the usb while booting, my bios just froze coz it cant detect the device, probably some usb device causing a lock

 

its also possible that simply u have to set the ram timings manually instead of xmp profile

 

last possibility is, ur pc isnt properly grounded causing issues

[Lars95]

3 hours ago, Valkyrie Lenneth said:

i used to have with a maximus vi hero board that if i had my phone connected in the usb while booting, my bios just froze coz it cant detect the device, probably some usb device causing a lock

 

its also possible that simply u have to set the ram timings manually instead of xmp profile

 

last possibility is, ur pc isnt properly grounded causing issues

Hey thanks for the reply!

 

i tried with nothing connected, still the same issue. It should be grounded ok, I’ve tried some different cables, and checked screws etc for ground. It looks alright. 

 

Ram timings might be something to test, I just have to actually get the PC to bios first