What is the version of the BIOS in your Toshiba laptop? Googling shows that versions earlier than 1.7 -- and in fact 1.7 too -- are buggy. Anyway, one of the work-arounds suggested by Toshiba under Windows is to stop the laptop throttling the CPU automatically if the laptop goes into battery mode (i.e. if you unplug the PSU). Which version of SL 4.1 have you got installed, the GNOME version or the KDE version? Whichever it is, find the power control/management menu and stop the laptop going into CPU power management battery mode when the PSU is disconnected. See if that stops the blanking screen when you unplug your PSU.
Another thing you can try is to add the boot parameter "acpi=off" to the kernel boot command line in the file /boot/grub/grub.conf. (Look in Wikipedia for an explanation of ACPI.) So, for example:
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kernel /kernel-genkernel-x86_64-2.6.29-sabayon root=/dev/ram0 ramdisk=8192 real_root=/dev/sda6 quiet init=/linuxrc splash=silent,theme:sabayon vga=791 CONSOLE=/dev/tty1 resume=swap:/dev/sda7 acpi=off
Don't copy/paste the above line or you will end up in trouble. Just add the acpi=off as shown above to your line. But try my first suggestion first.