My tv says no signal. I must have hit a button but I cannot get it back on. There is a long blue box in which it says No Signal on the left and then a channel number on the right.

1. Check your wiring connections, one may have come loose.
2. If the set-top box is connected to the television using a coaxial cable, then the television should be set to Channel 3 or 4 to receive the signal.
3. Discharge your TV, unplug your TV and press and hold the "Power" button for 30 seconds. Plug the TV back into the electrical outlet after 30 seconds and check to see if the problem persists.
4. Hit the Input or TV/Video button on your remote to see if there's a signal coming from another source connected to your TV. The input button will shift between a number of cabling connections.
5. Your TV may need a service.

Select the input channel for your Fire TV - Turn on your TV and select the input channel for the HDMI port you used to connect your Fire TV. You should then see a loading screen with the Amazon Fire TV logo 4.

hit the source button again that is for your scat press down to 1 HD should get you back on.

Refer to the manual (free download here). Generally, a blue screen indicates a very low or non-existent signal. This can happen when the antenna is unable to gather enough of a signal from a particular broadcaster, or if an A/V input is selected, but the A/V device is not on or providing a signal. Since you are not seeing channel information when tuning, I suspect that the television is set to display an A/V input instead of the internal tuner.

With a working remote, locate the TV/AV button on the lower left (manual page 3 - item 8). When this button is pressed, you can choose to display signals on the ANT, VIDEO1, VIDEO2 or COMPONENT jacks. The ANT selection chooses the input on the RF jack such as an antenna or cable TV (with or without converter box). If using a cable box, the TV tuner should be set to Ch3 or Ch4 as determined by your cable box. Otherwise, select the VIDEO1, VIDEO2 or COMPONENT input that has the source signals you wish to watch from a cable box, DVD player, etc. that is connected to the rear input jacks. Page 7 of the manual details the connection and remote operation.

I hope this helps!

Have you tried to push the tv input button? Sometimes when a button is buy accident it changes the input on the tv. Hope this works, let me know.
Good luck, Toni

Tries unplug the tv and the cable or satalite boxes too.Replug it all back like an hour later.The tv know will reset itself back to the factory setting.The cables or satalites boxes it upgrading it softwares.The tv should have incomming broadcasting signal and work now.Not,call the cables or satalites compannies to replaced those inputs boxes first,have the same problems with those new input cables or satalites boxes.Than the tv,the Tuner signal board have problems and the cause.That the board,where the incomming broadcasting signal cable plug into it.That the tv Tuner signal board.Tries websites Shopjimmy.com,Ebay.com to buy a whloe refurbish Tuner signal board for the replacement.

First try another signal input like a DVD player or other source, is the signal displayed ok? Then you have lost the signal on one input from whatever the device is.

Mine did the same thing once. I think all I did was hit the setup on the remote, and let it run back through all the channels and then it worked just fine.

I hope this works for you.

You will have changed the video/audio input, on your tv, it should be an input button on remote. The signal will either be on AV1, AV2, AV3 Component or HDMI.