Macbook pro 2018 dead after catalina

The computer might be on but unresponsive. Try holding the power button - on your computer it is the Touch ID button - for about 10 seconds. Then release and try starting the computer as usual. If this doesn't work to restart the computer, call AppleCare or make an appointment at an Apple Store. I won't say an OS upgrade cannot brick a computer but it is very rare.

Solved my similar issue. A few days after upgrading my MacPro from Mojave to Catalina, it crashed and wouldn’t restart. I kept pressing the Power button every few minutes. Sometimes nothing happened, a few times the Apple icon flashed briefly. After about half an hour, it flashed a battery on red, even though my PC was plugged in and the battery was at 100% before the crash. Unplugged and re-plugged (suggested by someone whose MacPro also crashed and restarted after doing this), then pressed the Power button. It restarted and restored the screen to what was up before the crash!

Same happened to me. Tried SMC reset, fiddled with it for a few hours. No Luck.

Took to Apple Store. I was told my computer's out of warranty and I need the logic board replaced. $800. Not sure how I feel about that given it was bricked after their OS update...

Mine too. Have to bring it in!

"Logic board... hope you have more luck. "

So then it wasn't the fault of Catalina as you stated. My install of Catalina on my 2018 MBP went perfectly and it runs the same as when I had Mojave. When you get your logic board replaced you should have a good experience with Catalina as long as you're running 64bit apps.

"Well I don’t believe in coincidence, so only an Apple engineer could convince me that the update didn’t broke some firmware or something like it.."

Well then I'm not sure why you posted here because Apple engineers don't come to this site to help people. Best of luck to you but I had no issues with my Catalina install on my 2018 MBP. Please think about this. We're all using Macs and installing the same OS. If many of us are not having issues with our MacBooks failing after installing Catalina then it comes to reason your hardware may be failing and that's not a cause of the OS. If you truly think otherwise then it sounds like you're not very savvy with computers.

An OS can't brick a computer if properly installed. Either the install was interrupted or there is hardware failure.

How’d it go? Just bricked mine too updating to Catalina.

Just dropped off mine yesterday at an Authorised Service Center here in Manila. Still under warranty but still awaiting diagnosis.

Wont power up after Restart prompt during update. None of the SMC/NVRAM/PRAM protocols worked.