Hi and welcome to these forums

Probably one of two things happened: Something went wrong during a firmware update, or you switched the mixer off while it was ‘busy’ (starting up or saving settings). Don’t do that. Your mixer is a computer inside so with power up / power down treat it as such. Always give the mixer time to fully power up, and try to use the power down menu on the mixer every time you want to switch the mixer off, or at least make sure the little saving icon in the corner of the display isn’t showing.

To get your mixer going again you should do a reset to factory firmware: Hold the Home button whilst you power up the mixer. Then do a firmware update.

Hope that helps

I just took my brand new presonus 32sx out of the box plugged it into my Furman power supply and flipped the power switch on and mixer will not power up. Tested the power cord on other devices which worked fine. I’m at a loss wondering why it won’t turn on. Could it be a bad power supply? I listen closely with the switch on and I can hear a faint hum as it is getting power to the board.

Unfortunately, this can happen and has happened several times in 2022, so you should either immediately return the mixer back to the shop (check the situation with them before shipping the mixer, also ask them for a replacement) or, if you have registered the mixer already, open a ticket and ask Support for assistance.

https://my.presonus.com > Support > Create A Ticket (orange "+" button)

This started to happen with my mixer (SL32sc) about 6 months after I purchased it. I tried everything, including disconnecting the power cord from outlet when not using the mixer. It kinda helped, but from then this non-startup tends to happen at least once a month.

What is your power down / tear down routine? Do you use the Power Off option from UC?

The mixer saves settings every time a change is made. Changes may include things like plugs removed from channel inputs. Saving changes takes half a second or so, so in a tear down / power down haze it is quite possible that the mixer is powered down in the middle of saving something, which may corrupt the settings the mixer wants to use the next time it is booted.

The only way to make sure that never happens is to use the 'Prepare to Power Off' option in UC. That forces the mixer to do a full save of all settings and then to stop working until it is rebooted.

I hardly ever forget to save my scene before I power off the mixer. I also don't think I ever turned it off before I went for power off first.
Obviously. I always wait for the "it is now safe to turn it off" message.