Unit was turned off last night. This morn, won't turn on, no picture/snow or anything. On/off switch has blinking green light today. Have tried unplugging and let sit for a hour, replug in hoping it would reset. No such luck. Can you help me..???

Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://homenol.blogspot.com/
http://electronicshelponline.blogspot.com/
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, [Exclude the model number] in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Try unplugging for 10 minutes.

Flashing is either an error code or the set trying to boot up--some of the Mitsubishi sets if power removed will blink for a minute and then stop--then the set can be turned on.

a model number?

Those blinks are fault codes. To know more visit the site linked here. http://electronicshelponline.blogspot.com/

Please read these replies to the same problem. A new power board costs around $284.00..

http://www.fixya.com/support/t465280-magnavox_37mf321d_37

First plug the charge adapter into an outlet, then plug into the unit. Push the power button to turn the unit on. Now, push the button for the light. The light should come on. At this point you hit the charge button and the green light should start blinking and there will no beeping. Then turn off the light. The green light should continue to blink and the unit will charge. This worked for me, hope it helps!

Unplug it from the wall, wait 2 minutes and plug it back in. if problem still exists, its probably the main pcb.

call tech and suggest c-chips.

Unplug the TV set, after a few minutes, plug it back again. If you are lucky, the TV will be okay!