Blade switching on failure

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There are several situations for switch on failure:
1.The first situation is that switch on failure is caused by hardware issue, generally the screen of device cannot be lighten up with this situation, you can just replace the device;
2.The second situation is battery issue, generally the battery power is not enough, you just need to charge the battery or replace the battery;
3.The third situation is software issue, usually the screen can lighten up normally, but the device will freeze on uncertain interface, you can directly refresh the new version for this situation.
4.Besides, for software issue, refreshing device failure also can cause switch on failure, and also the screen cannot be lighten up, you need to return the device to get repaired.

but most common is switch failure. the power on button can get dirty/greasy & stop working on the blade, take the back off & use the switch with the back off to test.