matebook doesn't want to start.

My matebook (Series‎ ‎MateBook E) doesn't want to start. I just see a logo that goes on and off. And again and again.. Can it be CMOS battery? If yes, where it is? I can not find it.

PS. if you disconnect the battery and connect it again, the laptop starts, but then after 1-2 times the situation repeats again.

The battery is holding a charge.