I got this unit new about a month ago or less. I have used it only twice and tomorrow will be the third time. My question is that when I cut it on it flashes(white) like a camera, then a few lines flash across( or some other strange image) before it shows HDS in big letters. Once the HDS comes up it still takes about 30 to 40 sec to power up the screen. Is this normal for this unit or should I get it replaced? Thanks