I have a Samsung s4040r that doesn't power back up after I was told to unplug and plug back in. Only the fan runs. No LED's or sound or picture. Suggestions please?

The first things to try are of course the simplest. If you have a picture on your TV but no sound, the problem might be as simple as having the “Mute” button the remote having been accidentally pressed. Grab your remote and unmute the TV by pressing the “Mute” button again.
Next, check what the input setting is on your Samsung TV by hitting “Source” on the remote and cycling through the available inputs. If your Samsung TV’s source is set to a component that you don’t have set up, then there won’t be any audio data coming in to be played.
Do you ever use a headset on your TV? Gamers, in particular, might be using a wired set of headphones plugged into an audio out jack, and if the headphones are plugged in, then any audio is being routed to that equipment, and you might not hear the sound playing if you aren’t wearing the headset. Assuming you never use a headset on your TV, check the headset port for any debris. Your TV may pick up something in the port which won’t allow the audio to route properly.
Finally if this does not work,you can try the old school way...unplug the your TV for about an minute.

Its probly wearn out..there not coold like a computr by a fan. Walmart gut fifty in for 200

Here is what to check when your TV is turned on, power light is ON, but no picture is seen or sound is heard:

1 - Be sure the component you are using (Xbox, Cable, SAT, ROKU) is turned ON.
2 - Check to be sure all cable and cords are securely connected to the TV inputs and component outputs.
3 - Make sure you are on the correct input as some TV's will show a black screen if there is nothing connected to that input.
4 - Unplug the input you are trying to use from the TV (such as an HDMI Cable) and plug it back in.
5 - Check for signs of damage on all cords and cables from the TV to all components.
6 - Make sure the TV is not in ENERGY SAVE MODE, press the button on the remote control to go back to normal mode.
7 - Unplug the TV for 10 minutes to see if there was a temporary one time issue with the TV.
8 - Disconnect the TV from power for 2 minutes, then when plugging it back in PRESS AND HOLD THE POWER BUTTON ON THE TV FOR 10 to 20 SECONDS to try and force the TV to reset.
9 - If after checking all these different issues, you may have a Faulty Power Supply Board, A Bad Capacitor on the Power Supply Board, Loose Wire Harness, or Loose Ribbon Connector in the TV itself.
10 - Most likely when a TV has the power light ON but NO PICTURE and NO SOUND, it is the Power Supply Board that has failed.

BTW, here are solutions for you to play iTunes movies on Samsung smart TV

it sounds like your back light inverter has gone. if its a led it could be built in on the power board. so check for bulging or leaking capacitors on the power board.

Hello sorry to hear that. From your description it sounds like your signal board may have been damaged by you plugging in your laptop to it. The signal board is the one with the tuner on it.

Turn it on and let it run for about 30 seconds. If it still doesn't work... unplug it, wait 15 minutes, plug it back in, then try again. If that doesn't work, you might want to contact Samsung to see if it needs repaired or replaced.

I had to replace the power supply in mine when it did that.

hold in the power button for at least 10 seconds. It should reboot. If not the DVR needs to be replaced.

Your hard drive may have crashed. Can you hear any disk activity when you plug in the unit? The hard drive can be replaced, but probably better to either just get a replacement unit (you can get them on eBay for $40 or less) or upgrade to a newer receiver.