Chosen Solution
I applied thermal paste to my CPU, but after reinstalling everything back in place and started up the laptop I only get the gray screen. What did I do wrong and is it savable
Hard to answer without any testing, it might be a screen as well as a logic board issue. Find an adapter to an external monitor/tv and plug in your Mac to see if you still have an image at least. Double check your Lcd cable is firmly in place in the connector too.
