The 3600 is actually 5 1/2 years old, although you may have only had it for four years. It's certainly possible it has failed. It's also possible it's a problem with your TV. First, do you see the bouncing Roku logo when you first power it on? Can you test it on a different TV, or at least a different HDMI port on the same TV (assuming you have more than one)? If you don't see the logo, and/or it doesn't work on a different TV, then it's likely failed in some way.
For $40 you can get an Express 4K+ that has everything your 3600 has (dual band WiFi, WiFi Direct remote) and much more (4K/HDR, far more power, more internal memory, ability to use an external Ethernet adapter). While my 3600 still works, I wouldn't think twice about just replacing it when it decides to no longer work.
Dan
Roku Community Streaming Expert
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