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I see you are going back to the 90's with your Super Nintendo. Firstly I do not know how you can "put the snes on chan 3". If I am correct, all super nintendo cables to the TV are RV coloured ones. therefore once it is plugged into the TV, you will ant the A/V channel? which usually has a separate button.
Secondly if what you say that you get a flash/glimpse of the game, then check the system of your TV. Is it PAL (Europe, Aus, NZ, etc) or NTSC (U.S.) Hopefully you can change the TV settings to match your game console!
Maybe the one that is not turning on to play game is broken then. Ensure that you have a known-good game cartridge inserted before powering on the SNES console. Most older, cartridge-based game consoles don't boot without a game installed.
Does the power light to the left of the controller ports turn on when you turn on the power switch?
If not, check your power adapter and outlet for functionality and good connection.
Check that the reset switch is not stuck. Wiggle it back and forth through its range of motion a few times. If something sticky gets in there it can get jammed in the reset position, which will prevent any game from booting.
You mentioned that there is no image. Are you getting any sound from your games after waiting a few minutes with everything connected and turned on?
If you hear game sounds or music from the SNES, but see no picture and you've already (really and truly) ruled out the cabling and TV, then you might have a bad main board in the console.
If you don't get any video or sound, then it's not booting your game. You can find other recommendations about how to clean game and console connections, but usually inserting and ejecting a game 10-20 times will knock loose or grind off enough gunk to get a game to boot. Try this, and be sure to use the eject lever instead of ripping the game out to avoid console connector damage. If it's still not working, repeat with another game.
if your using an AV cable, make sure all the connections are tight both at the console and at the TV or switcher. if your using an old-fashioned RF switch, make sure IT is plugged in tight to the console. check to make sure you have a working game, or clean the cartridge (which often causes a blank screen of death)
The CIC chip, also known as lock out chip, may have gone bad. Here is a quote from a site I found.
"Every SNES control deck has a regional lockout chip (known as a CIC),
as does every original SNES game cartridge. Before a game is loaded,
the console will attempt to communicate with the CIC chip on the game
cartridge. If the CIC chip doesn't respond or does not correspond with
the consoles CIC, the console won't load the game. In most cases, a
black screen is displayed."