Thanks for the info, after a few attempts I have managed to go to the bios and flash it using Asus tool. Things slightly improved, but the board is still temperamental.

Sometimes it doesn't boot, sometimes it does, but soon after window blue screens appear with different errors.

On occasion, the board works perfectly, and I can use windows for a few hours without any issues.

I'm pretty confident that this is a hardware issue

I thought this may be related to the temperature, the board seems to work better after a few booting attempts when presumable...

Trying to troubleshoot MSI z490 tomahawk board and would appreciate your help. The board is completely dead and shows no activity when the power button is pressed.

I have tried to look at the Superio, the PSIN signal seems to be correct (goes from 3.3V to 0 on button press) but the voltage on PSOUT pin is quite low. I

t is only 0.8V which seems to be incorrect but goes to 0 when the button is pressed.

Can you please let me know if this is indeed incorrect and what else should I look at next?

Thanks!

The MSI Mag z490 tomahawk board is not responding to pressing the switch button. There is voltage supplied to BIOS and superio but I would like to trace it. Perhaps somebody could share board view and schematics? Thank you....

Thanks for posting this, have you managed to solve the problem? I have something similar, the board starts, then stops after a second, then tries to start again and nothing happens.

After resetting CMOS I have managed to get to BIOS but after a minute or so it froze.

Could this be corrupted BIOS or something wrong with BIOS power supply?

BTW I cannot locate this 25Q128A chip on the board, do I need to remove a heat sink to find it?...

Hello guys, I work with software but watching Richard's videos got me interested in electronics and hardware. Happy to be here!.