Jazzy lines appearing just prior to login on Mac Mini

I just restarted my Mac mini (for no reason other than to give it a reboot) and I noticed a strange selection of varying jazzy lines, which flashed just prior to the login screen, the screen then cleared & my login screen was displayed. I could log in OK and everything was fine after login... so far anyways. I have posted a screen shot which I managed to capture using my Iphone.
Has anyone had this problem, should I be worried and if yes, how can I/do I need to fix it before it gets worse?
Cheers
Sue

The image is not displayed for me. This forum has problems displaying images sometimes.
I have occasionally seen strange lines/graphics on my Mac before the login screen. I would not be concerned unless you have other problems.

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