A device which we should all have - especially if we live in an area with dirty AC power.. For decades now, I have used a UPS=uninterruptible power supply.. Basically it is a box with a Large battery some circuitry.. The AC goes into the box. is converted to DC and stored in the battery. It usually has several AC outputs.. The output side converts the DC back to very clean AC. If you live in a rural area, or an old house, you will be more prone to glitches, or dips in current..
Well somehow, I unplugged, an then plugged my GENOS straight into my pre-war apartment's AC receptacle. A glitch completely crashed my GENOS, and now it won't even boot up. To make matters worse, with the pandemic the Yamaha affiliated repair shop in NYC is only open 2 days a week, 6 hours a day. They said it would be at least 2 weeks, or longer, because they are backed up. They wanted a $160 deposit, (that's to start), if there is more damage, it's gonna be steep, But I'm opening they just have to replace the programable Operating system chip. I tried to re-install update, but that wouldn't work either.
Prices vary for a UPS. Depending on the capacity of the battery you get. Most UPS will work for quite a few minutes after power dies, (giving you time to save projects on computer, kids. You really don't need more than 5 minutes.. I use a brand called APS.
I would call having a UPS a necessity.. This could have saved me from this repair, if I hadn't have slipped up.