Chosen Solution
I replaced the battery on the Yoga 900 ISK2… and now the notebook only starts after I disconnect and reconnect the battery after shutdown. This is true only for shutdown situation. Sleep and wake from sleep works. It is the same situation when connected to power or not. I also tried putting back the original batter and same behavior. Here is it in order: connect the battery - I can start the notebook pressing on the start buttonreboot works… will reboot without a problemshutdown works… but the I can not start the notebook again… the button to start will not workphysically disconnecting and reconnecting the battery… I can start it again via the button All cases I found with the same behavior (and other notebooks) did not have an answer. Any hints what this could be?
Likely either a battery problem or an issue with the connection on the motherboard. Take a close look at the port on the motherboard (use phone camera to zoom if needed). Do all of the pins, plates or whatever it uses look straight and uniform? If you still can’t resolve the issue, I know that a lot of repair shops offer free quotes and examinations so you can find the issue!
