Fedora display going balnk

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http://forums.fedoraforum.org – I have a system with P-III processor which works on 850 MHz with "siliconmotion" graphics adapter.My BIOS supports APM not ACPI. I installed a customized version of fedora-8 (only some application packages and services are removed, and all the driver packages are there). The problem is the screen goes blank after half an hour or so, even if I have set the Power Management option to "NEVER" for AC power and Battery, and a gnome screen saver is also there. After this also the screen goes black/blank and never comes up on mouse movement or keypress, only option is to reboo (HowTos)