Problem with Monitor, flickering green

It is not clear it is the hardware (your screen) but the Safe mode indicates that.

things you can try

• Disable Automatic Graphics Switching

• run Apple Hardware test.. Press D during startup

• disable any graphics controllers (external software) like the TechToolPro

• Reset PRAM/NVRAM..press Option-Command-P-R until you hear startup sound a second time.

• reinstall OS

• NONE of the above worked..lets get to the final step..Hardware.. it might be the Cable..see instructions here how to get to it, just pull it out and back in, while you are at it vacuum clean the interior.

_{This is considered a Very difficult surgery, so if you are not of a steady hand and very handy with tools, skip the step and go to professional place.}

After my MacBook Pro (15 inch, late 2008, 10.9.5) fell down this morning, I had a similar problem - just that in my case, the flickering was in red pixels, everywhere where a black color was displayed.

I rebooted, and on bootup, screen was completely black. I got a small screwdriver, and opened the back (removed battery, unplugged power cable...), then (very) carefully pushed and wiggled the display connector, which I found following the pictures in the link in Buscar's post. After reboot, screen was there again, however, the red pixel problem was still present.

I opened again the back, this time also vacuum cleaned the dust out of it, and again touched the display cable connector. And miracle happened, upon reboot, the red pixel problem had disappeared.