If the power supply is correct then check whether the cable is connected correctly.
Computer power supply switch on off.
To fix the problem that computer turns on and off repeatedly you can check the power supply and cable firstly.
The i represents power on and the o represents power off.
If this switch s setting is not correct for your country your computer may automatically power down.
If the input voltage for the power supply doesn t match the correct setting for your country your computer might not stay powered on.
On off power button symbols i o power buttons and switches are usually labeled with i and o symbols.
The first thing to do is to consult the voltage valet website to discern your country s correct voltage settings.
If the input voltage for the power supply does not match the correct settings for your country your computer might not stay powered on.
This designation will sometimes be seen as i o or as the i and o characters on top of each other as a single character as in the following photo.
The power supply voltage switch a small red switch on the back of the power supply may be on the wrong setting.