ASUS TUF GAMING B550-PLUS + reboot causes a freeze + Kubuntu 24.04

[vanadiumboy]

Hello
I bought a new mobo since my other one was causing data corruption issues while writing to the HDD for years.
Changing the SATA port and changing HDD, and changing the SATA cable itself did not help, so I bought a new
ASUS TUF GAMING B550-PLUS WIFI II

https://www.asus.com/motherboards-co...-plus-wifi-ii/

My OS
Kubuntu 24.04, it is always up to date

Booting up from complete power off is never a problem.
Shutdown is never a problem. It completed the shutdown and the PWR LED goes off.
I never use sleep mode.
If I do a reboot, quite often, it does the Kubuntu shutdown process and when it looks like it is suppose to give a black screen and show the first POST screen, it just stays on a black screen.
Pressing the Reset or PWR button does nothing. Pressing the PWR button for 30 s does nothing.
I have to cut the power from the Power Supply.

Then it boots up just fine.
I am wondering if this is RAM related. My RAM was at DDR4 3200 MHz. Should I reduce it?

BIOS
I have applied the BIOS version
3636
which is from 2026/01/28

Thanks!

[skyfishgoo]

do you have secure boot enabled in the BIOS?

are you sure the PSU is up to the task, these newer m/b seem to make higher demands from the PSU of they will not boot.

i went round and round the RMA of an MSI motherboard and finely gave up an got an ASUS m/b but still had a similar problem until up upgraded the PSU and it's been fine ever since.

ended up moving from a BeQuiet 1000W to a Seagate 1300W and haven't looked back.

[oshunluvr]

That;s a lot of wattage!

[oshunluvr]

If I do a reboot, quite often, it does the Kubuntu shutdown process and when it looks like it is suppose to give a black screen and show the first POST screen, it just stays on a black screen.

That does sound like it could be a RAM problem, but the information so vague it's impossible to tell.

Next time you want to reboot, log out of your user account and note the time.
Then press CTRL-ALT-F3 and log in to the terminal.
Enter "reboot" and watch what happens.
Take note or a pic of what you see when it's frozen and report back here.

Also, once you've booted up again. Review logs and see if something sticks out around the time your rebooted. "sudo dmesg" and "journalctl -p 3 -p 2 -xb" would be a good start.

You could try slowing down the RAM freq. also.

[vanadiumboy]

do you have secure boot enabled in the BIOS?

are you sure the PSU is up to the task, these newer m/b seem to make higher demands from the PSU of they will not boot.

i went round and round the RMA of an MSI motherboard and finely gave up an got an ASUS m/b but still had a similar problem until up upgraded the PSU and it's been fine ever since.

ended up moving from a BeQuiet 1000W to a Seagate 1300W and haven't looked back.

Secure boot is disabled.
It is a Corsair RM650x 650 W 80 plus gold.
The most power hungry thing in this PC is the video card = AsRock Radeon RX 6800 16 GB, it is a long card, 3 fans.
I have a 1000 W power supply elsewhere that I can try if I can't solve this issue.

I forgot to mention. At reboot, when the black screen shows, the mobo has a LED for the DRAM and it turns ON, indicating a RAM problem.
All 4 slots are used. I have 8 GB, 4GB, 8 GB, 4 GB.
I pushed the RAM to 3333 MHz but it did not cause system instability and this PC is often on 5 days.

Right now, I set it to 2800 MHz.

[vanadiumboy]

That does sound like it could be a RAM problem, but the information so vague it's impossible to tell.

Next time you want to reboot, log out of your user account and note the time.
Then press CTRL-ALT-F3 and log in to the terminal.
Enter "reboot" and watch what happens.
Take note or a pic of what you see when it's frozen and report back here.

Also, once you've booted up again. Review logs and see if something sticks out around the time your rebooted. "sudo dmesg" and "journalctl -p 3 -p 2 -xb" would be a good start.

You could try slowing down the RAM freq. also.

I forgot to mention. At reboot, when the black screen shows, the mobo has a LED for the DRAM and it turns ON, indicating a RAM problem. <===============
All 4 slots are used. I have 8 GB, 4GB, 8 GB, 4 GB.

I ran at 3200 MHz for a few weeks and this problem was present so I decided to increase to 3333 MHz to see if things get worst. Nothing changed. It rans fine for days, gaming, websurfing until I do a reboot.

I set it to 2800 MHz today.

[oshunluvr]

You might try pulling two RAM sticks and seeing if it still happens. If is does, pull the other two and put the first two back again. If it still happens after that, it's probably not the RAM.