If the power is on, reboot the computer to see the initial screen (the login screen), which can be seen. * DVI/HDMI/DP input is not available on every model. (Connected using the DP cable] Check the DP cable connection. (Connected using the HDMI cable] Check the HDMI cable connection. (Connected using the DVI cable] Check the DVI cable connection. Is the cable connected correctly? Connected using the D-sub cable Check the DB-15 cable connection.
Is the power cord connected properly? Check the power cord connection and power supply.