If the Lenovo Yoga won't turn on no matter whether you have connected the AC adapter or not, you should do the following things: If the Lenovo Yoga turns on only when you connect the AC adapter, you should consider the battery is damaged and you need to replace it. In this case, you just wait until the PC cool down and then try turning it on again. If you have heard some fans noise, you should consider the problem is caused by overheating.
When you turn on Lenovo Yoga, please note whether there are some noises. You will be unable to turn it on till it gets down to its normal temperature. It shuts down the system once it is overheated. Many laptops have an internal thermal protection system. Sometimes, Lenovo Yoga won't turn on, just because of overheating.
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Read More How to Fix Lenovo Yoga Not Turning on Issue Fix 1. To troubleshoot this issue, you can try the following methods. You should check many aspects, not only the battery and AC adapter. The reasons of the "Lenovo Yoga won't turn on" issue are various. There is no BIOS message, no movement nothing on the screen. The laptop won't turn on and is stuck on the black screen.If the AC adapter is removed, the laptop won't turn on. You can turn on Lenovo Yoga only when the AC adapter is plugged in.