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These answers were given assuming that you're using a LG smartphone with a touch screen :
Scenario 1 : Can you see the screen lights up and any sort of graphical image when you hear incoming message ?
A : If you can, and still you cannot slide unlock, your touch screen has gone. Get a replacement touch.
Scenario 2 : You cannot see anything on the screen. It stays dark when you hear incoming messages/calls
A : Your LCD has gone. A replacement LCD or a Touch/LCD combo would fix the issue.
You may have to do a hard reset, remove battery and memory card, replace battery, hold down on/off button & green & red buttons all at the same time. This will fully reset the phone but you will loose all stored data, which is why you remove memory card first.