Mac book Air : 13 inch early 2016
Processor: 1.4 GHZ intel Core i5
Graphics Card: Intel HD Graphics 5000 1536 MB
RAM : 4 GB
Model: A1466
HD: 128 GB SSD

Issue: My buddy advised that he spilled coffee on his mac book air keyboard. Some of the keys work and some don't. Plugged in a usb keyboard and was able to browse and use the machine like normal. Just purchased a top case to replace it from ifixit to swap it out.

My question is when I reboot the machine I get a strange flickering like the video card is going bad. Ironically when it boots up regular and safe mode it' works fine.

Any ideas on what might cause this? And can you replace the video card on this macbook air or is it integrated into the motherboard? any help would be greatly appreciated.