Screen says attention no signal
Green light stays on only briefly. Says "attention no signal" then goes black and amber light comes on.
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Product Troubleshooting for Magnavox 15MF400T 15 in. LCD Television
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Your TV is probably on the PC mode and you are not using it as a PC monitor.
You need to change the source by pressing the TV/Video button on the remote control or the SOURCE button on the TV itself. You may also just press the channel up or down buttons. Do this before the TV goes to standby mode (amber light) or while it shows the message: ATTENTION NO SIGNAL.
If it does not work, reboot the TV first and do this again.
I had the same problem. I went to the Magnavox website which suggested it could be caused by a problem with the power supply. I checked and found that my power cord was coming apart in the middle. I pushed it back together and fixed the problem.