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10 so any help you can give will be very useful

I'm using an HP G62 laptop with intel HD Graphics card and an intel i3 Quad-core processor. When i first boot my laptop, i can login just fine and work with the system.

The problem begins when i lock the pc, when i leave it for a few minutes and return to work with the login box appears, I type in my password and press enter, the screen goes blank and all i can see is the mouse curser. And it hangs there till i either do a hard restart (holding down the power button) or when i log into tty1 and restart lightdm, the log in screen comes back and i can log in again but all my previously open programs are closed and all unsaved data is lost

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