Why isn't my S3 starting up?

[AC Question]

my s3 not starting up

On updateing firmware my s3 stop working trying to reboot system but comes up with the android with a red triangle with no command under it looking to see if anyone can help

 

[Golfdriver97]

Re: my s3 not starting up

Welcome to the forums. I would try pulling the battery for a few minutes, then rebooting.