Hi Fairly new to the site as a member. But last week i had a similar problem i had just bought a tracer battery for my NS50 when this was plugged in no problems but when i plugged in the origonal battery same thing a flicker on the screen then nothing.I charged the battery and tried it again same.Got the spark at work to check the battery it seems it was not taking a full charge.Phoned Nitesite told them the problem.Next day a new battery /charger/and some screen filters arrived via the post.
Most helpful and great service. Hope it gets sorted quickly for you.