I have found out some interesting things... among which, a related device model to the one you have, is listed as turning dark-screened when you change the backlight setting, sometimes.
I presume your unit is not just dark, but really dead.
It's warranty by the way is longer than usual, 24 months, but being 3 years old, it's too late for warranty considerations.
New Zealand locations that might be able to assist with your SureShot 700x and replacing its battery:
0800 666 483
e.g. one of their stores, is in Hamilton at
Omni Tech Hamilton (The Base)
Te AWA The Base Shopping Mall
Corner of Te Rapa Road & Avalon Drive
Omni Tech Hamilton Centre Place
Shop K13 (outside of the Farmers store),
Centre Place Shopping Mall.***** Hamilton
Phone: 07-222 2099
ServicePlus (in Auckland, Wellington, etc.)
0800 00 77 22
If none of these are acceptable, or none can help you, let me know, and I will get more listings.
If this answers your question, please rate my answer. A five-star rating would be appreciated!
(If you need more info, or have any comments, use Reply To Expert to respond.)