Blue light keeps blinking won't come on

Check for back lighting. The screen will glow.
Sound like the power board is out.

Are you able to plug it in via ethernet?

Unplug,replug the tv back like 24 hrs later.That the whole tv is resetting itself everythings.Tv now should be working again.If still have the same problems,than ur tv DM power supply board is have dying parts,must repair the tv DM power supply board to fix the tv.

the problem is the cooling fans they probley need to be cleaned there are two of them i have a 60v710 hitachi too

here's your answer probably not what you wanted to hear...
https://www.dell.com/community/Monitors/Monitor-Won-t-turn-on-Blinking-Green-Light/m-p/2558319

Unplug the DVR for about 20 minutes and then plug it back in. If that doesn't work its probably time to contact DTV for a replacement.

i have a kp51ws520 that i just fixed. it blinked 9 times. found out it was the g board. got it done pretty cheap . let me know if you need more info.

Purchased just a month ago? It should still be covered by the manufacturer's warranty. Unless the seller isn't a legitimate retailer. Try warranty repair before worrying about fixing it yourself.

sounds like a dead battery. Plug the origional charger into it and the front led (below the flash) should flash red. If the red led in the back of the camera flashes or stays lit, then you have the wrong charger plugged in. (the camera won't power up if the back red/green led is on when plugged in)

I would suggest that you guys turn the unit off when this happens, unplug the unit for 30 seconds, plug it back in, and see if this helps. If this does not solve your problem, you should call 1-800-448-2244, so a service center in your local area can be found for further assistance.