My toshiba lapton screen is not coming on, please help, but power is on.

Are you powering up the laptop and finding the screen won't show anything or have you started to use it, walked away for a bit and come back and the screen won't come back to life?

Hit some keys on the keyboard as well as trying to move the mouse - that should bring the screen out of standby if it's in that.

If you are powering up and the screen isn't working - take it to a repair shop. That sounds like something you need a professional to look at.

Sometimes you can change the output of a laptop to plug into a projector or large screen. This will cause the display to be off.

If you have the manual for this laptop, just have a look for sections on changing the display output or something similar. Usually a function button combination will switch the screen back to normal.

What model of Tosh Laptop is it??

Take out the battery, plug it in, and then try to turn it on