Pressing the power button when your TV isn’t plugged in will never do anything. (Think about it.) If your Vizio is stuck on the logo the problem is the main board, which you can replace. I had the same problem and fixed it. Before you say "No way I could open up my TV" that's what I thought but after looking at a youtube video on replacing a Vizio main board I realized you just need a screwdriver and to pop out the old board and put in the new one. It’s only $50 for a new main board and what do you have to lose if your TV is otherwise broken? My VIZIO E600I-B3 was stuck on the logo, and I ordered a used "main board" from a parts site online. I removed all the screws from the back. Then I carefully placed my TV face down on a towel on a table and popped the back off. The main board has several connectors. Carefully remove them (take a picture first so you know where the connectors go), unscrew the four screws, replace the board, and put the connectors and screws back, and then the back on. It took me an hour because I was being slow and careful. Cost me $50 for the board and my Vizio is working as good as new!