My screen suddenly goes black and can never turn back

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http://forums.fedoraforum.org – You can "hear" that everything is still running behind that black veil. But when it happens i gotta reboot by shutting down power. It's a 5-6 year old laptop, but this showed up with fedora 18 kde (and hasn't occurred in windows yet). (It's fine again after reboot, until it happens again.) ABRT said: 'A kernel problem occured, but your kernel has been tainted (flags: GW)...' 'Warning: at drivers/gpu/drm/i915/intel_display.c:1049 intel_enable_pipe+0xb6/0x180 [i915]()' lxpci said: Code: 00:00.0 Host bridge: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub (rev 0 (HowTos)