Hi beam indicator on constant

The usual cause is a bad ground.
Check the ground with a test lamp.

What make , model and year vehicle ?

your switch is not good try to double check your switch.

Good Evening, a blue light on your dash has been an indicator that the bright lights are on. There is nothing wrong, just simply turn them off and use your low beam lamps by moving the dimmer( turn signal) switch.

You need a new headlight dimmer switch located on the steering column between the dash and the firewall

Possibly your lights are on timer, or an auto dim, or auto lamp function.

Hi. That sounds like the Low/high beam switch is malfunctioning and in need of replacement. I believe this because the headlights will not come on no matter which power source is attempting to activate them. Clearly, they are not getting power. Since the high-beam indicator light is functioning and indicating HIGH BEAM it IS getting power, There is no further interruptions in that circuit, save the fuse. IF the fuse is good,.. tested good.... Then the switch is bad, if the fuse is bad... replace it. If this doesn't solve the problem You have blown all your headlights simultaneously, or lost all the connectors to the headlights all at once, or possible got so unlucky as to lose all connectivity to just the headlights magically. I'd bet the fuse if I didn't believe that you would have checked that before posting the question here, and that doesn't account for the indicator to be stuck, so.... This pretty much leaves the switch ol buddy, sorry.

change the light bulb

have you actually checked the bulbs wit a vom and if not, do that first, second check power to high beams, thord check high beam relay and fuse, fourth check switch. Complete directions or available online if you need a link. I hope this info helps you solve your problem, Merry Christmas!