For last two three days I have been experiencing this problem. My MacBook Pro looks like this while booting up:
But after running for 30 or 40 min this thing goes normal, no problem at all after that time. A strange thing is it happens when there is a long gap between successive booting up of it.
I have tried resetting NVRAM and SMC but no luck.
My MacBook config is as follows:
macOS Sierra Version 10.12.5
MacBook Pro (Retina, 13-inch, Early 2015), 2.7 GHz Intel Core i5, Memory 8GB 1867 MHz DDR3, Graphics Intel Iris Graphics 6100 1536MB