Computer locked up overnight and won't post after

specs ryzen 2700x, x470 tachi (not ultimate), G.SKILL Ripjaws V (2 x 8GB) running at 3200 cl 14, 1070 ti

Quick backstory have had this computer for almost a year now and it would sometimes lock up when rebooting both on shutdown and boot up when on the windows ?œworking??wheel screen. After a couple of bios updates (last update I did was about 3 months ago) and turning off amd cool and quite it didn?™t seem to lockup as much or at all when rebooting. Also once booted never had any stuttering or freeing issues once it booted so I didn?™t care too much since I only rebooted every week or two.

I get home today and it?™s locked up like it has before but this time when I hard reboot it fails to post now. The dr debug goes through what seems like the usual amount of codes but then stops at 90 for a few seconds then goes through a couple of codes (notable ones 51 and 54) then stops at 90 again indefinitely.

Things I have checked cleared cmos with button on mobo and removing the battery, tried different gpu, removed all drives, booting with only one ram stick at a time.

Based on the codes it looks like both of my ram sticks died and unfortunately I don?™t have access to any extra hardware to verify. Just figured I would check here to see if anyone had anything they think I should try or check before ordering new ram and going from there.

OK, a quick search yields that the 90 debug code is connected to the Boot process, more specifically, initializing the boot process.

Disconnect everything from your board except for CPU, 1 stick of RAM and your GPU. Disconnect all drives from the board AND the PSU as well as anything else connected to the PSU.

Pull the power from the PSU (disconnect from wall), then pull the CMOS battery, press the power button for 10 seconds and then push the clear CMOS button for 10 seconds. Leave the system disconnected from power for 1 hour then see if you can get POST.

If all goes well and you can get into the UEFI then start connecting things back one at a time, testing between to see what caused the issue.

As I was typing the other reply I had actually just started trying this just waiting with the cmos battery out without power connected.

Ouch, well, then it's time to try what I suggested in my original reply:

1. Try another PSU, Seasonic is excellent but not immune to failure
2. Either test the RAM in another system or just RMA it to G.Skill
3. RMA the CPU
4. RMA the Motherboard if it's still under warranty

Obviously try one at a time starting from 1 and moving down the list until the issue is resolved. Also, just an FYI, the 90 code is the only one that matters, the debug display will cycle through all the codes while POST is under way, each code signifying a particular process so when one gets "stuck" that indicates the process that failed. Checking what the code is for gives you a solid lead on what the problem is

Just to update on this topic it ended up being the Processor.