I have a Lenovo Thinkpad Yoga S1 that won't charge. Sometimes when I plug it in there is no reaction from the computer aside from the "i" indicator continuouly flashing in sequences of 3s. Other times when I plug it in it says "plugged in, not chrging" and the "i" indicator flashes 3 times, then 6 times. If I remove the battery, I can run the laptop off of AC perfectly fine but the CPU is limited to 0.78 GHZ and the laptop feels very slow because of it. I have two batteries and I have tried this with both of them but its the same result for both. So it's not a problem with the battery. I have also tried the AC adapter on another laptop and it charges fine so its not a problem ith the charger. There was a big windows update a day or two before the issue started so I'm wondering if its just a software problem. My warranty is expired so I'm really hoping this is an issue that I can fix on my own without having to send it in to Lenovo and be billed for it. Any help would be greatly appreciated.