Chosen Solution

So after laying on the table for a day draining power (it was closed) I wanted to use it. So I plugged it in as usual. Although this time I got a blinking light on the magsafe plug ( never seen this before). I have done both harddrive and ram update successfully. I have no idea why this suddenly happened. I have tried the common solutions (replace DC in board, plug out battery in and out). My battery is drained so I can’t turn it on. I do have to batteries I have tried to get it working with and two charger, but with no succes. Please help me?

Given the age of your system your battery is likely worn-out! So you have access to a spare to tryout? I would start there MacBook Pro 13" Unibody (Mid 2009-Mid 2012) Battery