It won't turn on and the light on the back is flashing?

you need a mainboard or powersupply

One of your bulbs is out. Turn your flashers on and walk around your vehicle to see witch one it is and replace it.

turn signal flasher. check your user manual for location and style

the flashing green light is ethernet.

If your security lights flash and the key light is on,replace the battery in your fob.

the green light blinking is normal if set has been unplugged--when set is plugged back it should blink for about 70 seconds and then go out--then you can try to turn it on---it is the DM unit inside the set booting up.

If the light just blinks and never stops you have likely bad caps in the DM unit---there are kits available for that.

The other possible reason is that so called reset switch may be bad--fairly easy way to find that out and it is more common than you would think, let me know if you have questions.

SD TECH

If the power light flashes once when power button is pressed, then turns off and won't turn back on, the system needs repair.

Power Light Shuts Off
If the power shuts off during game play (even as much as 30 minutes after the system is turned on), then turns off and won't turn back on or the fan isn't working, the system needs repair.

Power Light Flashes
If the power light flashes once when power button is pressed, then turns off and won't turn back on, the system needs repair