I have unplugged the tv, removed all cables, including hdmi, slotted them back in, left the tv unplugged for days, put it all back together and tried again but it still won't work.
The remote control has no effect.
This is what happens...
The Samsung Smart tv logo appears and goes off, the led light in the bottom right corner flashes five times, a window appears in the top left saying hdmi1/dv1, then it all goes blank and the cycle starts again.
I apologize for any inconvenience this has caused. Can you try the following troubleshooting steps provided in the link?