Is the little indicator light on the stick illuminating?
If not, do you have another power adapter you can try? Needs to have a rated 5vdc output at least 1 amp (see fine print on adapter).
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking " Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X