Changed to sign-in options to sign in every time as I am away, and that does what I want. Wake-up on mouse with requirement to log in. Problem solved
I would like to use my Vostro in closed position (with external monitor) and need an alternative way to start it, not with the power button. I tried to enable wake-on-lan, but there is not such an option in the BIOS (no power options at all). Wake-on-WLAN, Wake-on-Lan would be ideal but wake-on-mouse/keyboard would also do. Or potentially an USB device with a power button. Do you have any idea what might work?
Wake/power up Vostro 3425 without power button