MacBook Air (early 2014 version) is not booting after SMC reset

Hey,

I bought this refurbished MacBook in 2014.

A few days ago, the battery level was around 10 - 15%. After that I left the MacBook on the sofa, closed the lit and wanted to turn it on yesterday. Unfortunately, this did not work. I thought that this was probably because the battery was now completely drained. So I plugged the MacBook into the charging cable. After attaching the charging cable, the light turned amber, indicating that it was indeed charging the MacBook.

After a couple of hours I decided to turn it on, but it still did not start.

Now it's been around 24 hours attached to the charging cable, the light is still amber and nothing happens, when I press the power button. The MacBook stays silent and there is no fan or any other noise, when I press the power button.

I already searched this forum, the ifixit forum and YouTube for helpful advises and found out that I had to do a SMC reset. I did this by pressing the Power button + shift + ctrl + option buttons at the same time. The amber light turned to green for a few seconds on the charging cable, but still nothing happens when I pressed the power button.

Since I don't know what I should do now, I was hoping that someone might help me here in this forum. Does anyone know what this problem might be related to? Faulty Batteries?

Any help would be appreciated.

Thank you in advance!