Stop sign and Backlit keyboard

I assume you mean the stop sign when you try and turn on the keyboard light?
It means that the Mac thinks it's too bright to turn them on.
I had a 2007 MBP, as far as I know the light sensors for the screen dimming and keyboard lights are in the speakers. I found when I covered both speaker grills they usually activated.
Another option is to download Lab Tick.
This sits in your menu bar and lets you turn the lights on and off without being limited to the ambient light level.
If that doesn't work properly then there could be something else wrong. Unfortunately I wouldn't know how to solve that.

What do you mean by the "Time remaining on my menu clock"?

I think he means the time remaining on his battery charge.

I tried to turn the backlit keyboard up again, before and after reconnecting to the external power, and it doesn't move, it is off and there is a circle with a diagonal line below it (a stop sign).

Did you move your MBP to a well-lit area while doing all this? The backlight only comes on when the ambient light sensor detects that it's dark enough. If it's still a problem, you may want to try resetting the SMC ( KB article).

Yang

HI,

*"there is a circle with a diagonal line below it (a stop sign)."*

Called a prohibitory sign. When you see this, connect the power adapter ASAP.

If this is the original battery, it's most likely time for a new one.

Also, most 3rd party energy software can do more harm then good.

More info here: MacBook, MacBook Pro: Battery not recognized or "X" icon appears on menu bar





Carolyn 🙂

What do you mean by the "Time remaining on my menu clock"?
Is this a 3rd party program?
Chris

Ah that makes sense.
In which case yeah, try turning all the lights off in the room so it's dark and then try the keyboard light again. Should work.

Ok. You could try temporarily disabling SlimBatteryMonitor and restart to see if that makes a difference.
Also, have you got a Unibody MBP or the previous generation?