Magsafe Red Flash

Mine is flashing red for a couple second before it turn to amber and start charging the battery, and I assume that period of time and red flashing is when the power adapter try to get connection and communicating with PMU and estimating the battery juiced for whether it should turn to amber and charge it or turn green if the battery is fully charged.

But if yours took hours for it, maybe you got faulty power adapter of faulty communication between adapter and PMU, try reset PMU before you turn that macbook and or poweradapter to apple store.

Good Luck.

I would call applecare right away. You really do not want to be messing around with a potentially defective power adapter. It could be a fire hazard, an electrocution hazard, or it could just fry the insides of your macbook with a very disturbing buzz.

I have to say, though, the concept of the power adapter blinking RED interests me greatly, like waking up to the sound of a fire/burglar alarm. If what you're saying is true, than obviously Apple put this safety feature in for a reason. I'm personally curious as to why you would leave your computer plugged into a BLINKING RED power adapter for SEVERAL HOURS just to see what happens. You disturb me, arrivingalive, and greatly so. 😀