Screen flashes "Lens cap"

when you insert a battery into a hero3 or 3+ black model you must wait 4 seconds before trying to turn it on or it wont turn on until you remove the battery and then reinsert it while waiting 4 seconds to try and power it up:
Need a night vision or flat lens for your gopro contour or drift hd cameras?
RageCams Will Price Match & offer better custom tailored installation kits with their lenses to fill the gaps & hold focus which is very important. We offer more HQ lenses / replacement parts & have serviced more gopro cameras than anyone on the net & at the highest quality service available. Scratched your gopro lens or damage your led readout screen? We can replace it for you quickly or offer you the parts to do it yourself. HD Wearable Video Custom Mods By RageCams
HD Wearable Video Custom Mods By RageCams

You need to go in and physically open the lens cover.
1. take out batteries 2. remove memory card + the small phillips screw.
3. remove the 3 remaining exterior screws. carefully with a small flat tip screwdriver pry the plastic halves slowly. eventually they will come apart. 4. at the bottom remove the small ribbon cable. 5. disconnect the mini motor wire, black and red. 6. unscrew the motor drive for the lens cover and then open the lens. 7. purchase a new lens cover motor. 8. If your screen still says turn off , then press menu and delete some files. good luck ! Work Slowly and carefully and ground your hands to a pipe somewhere before working on the unit. the static electricity could ruin the circuits !

CCD (imaging IC ) went bad and require replacement.

KEEP UR HAND CLOSE TO THE LENSES, FACE DETECTION IS ACTIVATED OR U RA MAKING PICTURES OR VIDEOS IN THE NIGHT. TRY WHERE THERE IS LIGHT

remove the lens unit and there is one iris on ur camera that was not open .u remove that part and cleaned well then it will okk

This blog post outlines repair procedures for stuck lens covers. An A400 is used as an example. But for the A610, you might want to extend your zoom all the way out before removing the camera's batteries. Note that the A610 has four shutter leaves instead of two, so pay particular attention how they're assembled if you remove the lens ring. Also you'll be applying the ring loosening rubbing alcohol around the barrel's perimeter instead of the front as shown in the procedures. One other thing, try not to get any alcohol on the lens itself:

http://camerarepair.blogspot.com/2007/11/repair-of-stuck-lens-covers.html

Good luck, and remember to do this only as a very last resort (try the other listed procedures first). Oh, and if you do decide to try the repair, please post how it went.

Try removing the battery, wait 30 seconds, and plug it back in. That may reset the lens cap sensor.

If you're getting the 18-4489-957-000 error code, then give it a good tap on the corner where the lens cap is. A little tapping and the lens cover should pop closed. When you turn the camera on again it will probably work just fine.

I was just about to junk my camera when I googled the error code and found this very tip in another thread. It worked like a charm.

this sounds a lot like the infamous "lens cap" error, common with many models. check this out - http://www.fixya.com/problems-solutions/t102431,p398108/JVC-GR-DF450-Mini-DV-Digital-Camcorder.aspx I can't figure out If this model is on the list, I'm guessing there should be more to the model name here. Anyway, if you contact them you might learn its a free repair. Good luck

Sounds like you may have a problem in the auto iris curcuit or the auto settings was switched to manual and the lens is closed. Check first to see that the lens is setup in auto mode. If it is then the auto iris as i said before is bad or stuck closed unless the small caps in that curcuit went bad as they always do after a few years. Good Luck