How to disable energy saving on notebook screen when using Scientific Linux 6.3?

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http://unix.stackexchange.com – So there is a notebook that has Scientific Linux 6.3 installed with GNOME. If we don't press any button on the keyboard or move the mouse, the screen of it turns black. But: if we move the mouse/hit a button when the screen of it went black.. it still stays black.. it's not a hardware problem, it's a problem related to the OS. I didn't find any energy saving options for this in the BIOS. I the screen is black, we can slightly see that the OS is still running, but it's very-very-very dark.. The only solution is to press the power-on button for 5 seconds to turn the machine off.. Any sol (HowTos)