Why is there a green robot on my phone not doing anything?

[AC Question]

have samsung 4 and on switching on have green robot

have green robot in cenrte of screen says down loading do not turn off target
cant turn phone off or do anything with phone do not know what this thing is its been like this for an hour now

 

[B. Diddy]

Re: have samsung 4 and on switching on have green robot

Welcome to Android Central! How did you turn the phone on? Did you happen to press both Power and Vol Down at the same time, or did you only press Power?

I believe that as long as the phone isn't connected to the computer and you're not in the process of downloading a system file to the phone, it should be ok to power the phone off by pressing and holding the Power button, then powering back on again.