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It is almost certainly the LCD inverter which is the cause of your issue. It ism ore common for the inverter to develop a fault than a backlight bulb on the LCD (I used to work in a Toshiba repair centre).
Replacing the inverter should be simple, just make sure the unit is powered off with the battery removed so you don't get an electric shock.
Hope this helps,
Not all PC are capable of running Vista at its full potential. This is not a Microsoft fault, but equipment manufaturers not supplying the drivers for older hardware. I recommend you to run the Vista Upgrade Advisor from the Microsoft website, to see if your laptop can run (that flavor of) Vista.
how long have you had your laptop? the toshiba laptop battery can be normal used in 400-500 cycles, that means normal in 2 years. if the age is over 2 years, the battery declines day by day. get a new one if it is unnormal