It seems that when my mini comes out of sleep mode, the screen goes blue for a few seconds, and then will repeat this periodically. but then it seems to stop after a few minutes, is this a hadware isssue, or maybe something with my monitor?
you can email privately if you have an answer.
My laptop does this when I plug in an external screen. Perhaps your monitor needs reset or something coming out of sleep. In my case the Laptop is awake and running but plugging in separate screen causes a sort of recycle of the display(s). Both the LCD and external do this and then they display normally.