Funny Apple Logo colors during startup When my iMac boots up the apple logo and progress bar flicker red very briefly. There doesn't seem to be anything else the matter with the computer apart from this. It's a very new retina iMac running macOs 10.12.1. 

Should I be concerned? Does anyone know why it does this? 







UPDATE: My iMac has started being glitchy rendering certain pdfs. As advised I'm going to take it back to the store.
Thanks everyone for your feedback. I called Apple Support who ran a few remote diagnostics and then referred me to my local Apple Store. The guy there booted my iMac as a monitor to another Mac and it still played up so he concluded that there was a problem with the logic board and it's currently being replaced.