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It sounds like your camera settings have the( AF Assist Beam) on Off? That is the Amber Color light you see when you half press the shutter button. If that setting is set to OFF, then the camera can not focus in low light giving you blurry pictures as it can not see any light to assist the camera on focusing. If you turn on the (AF Assist Beam) to on, they when you press the shutter button half ways down you will see a Reddish/ Amber light, that light helps the camera find a focus point, giving you a slightly better low light photo.
It's attempting to tell you that AF has failed. I'd expect low light, low contrast, reflective subject like a mirror or chrome. A solid colour wall with no contrast will also cause a AF failure. Auto Focus relies on contrast. Switching to manual mode shuts off the system and you can take a picture with nothing in focus.
The built-in flash can function as an autofocus illuminator. This helps with focusing in low-light conditions in the AF mode.
To disable this function, press the menu button, then select service1 menuitem, then AF illuminat., and finally, select OFF.
As far as I know, the autofocus (AF) light is needed only in lower light conditions to illuminate the subject.
You may not be able to rely on it working without having good light available so you should try some shots in poorer light to see if it is really not working before depending on having in-focus snaps.
If you don't use it in low light conditions, you may not miss it.