Satellite L300 - Screen wont wake up and flickers

L300 screen went to sleep one day and wont wake up. Shut the lid then pop it open again it flicks the light on for about half a second then flicks off again.
I now have a secondary monitor hooked up and programmed to use that as primary. Everything else seems fine. Except the laptop screen wont stay lit. If I say turn off laptop screen, then say use it, it flicks on for half a second then off again.
So the light does work it just wont stay on.
When I first tried pulling out batteries and unplugging everything, I got it back. For about 15 minutes, then it started to flicker , then I lost it. Back to popping the lid for quick peeps then using guesswork and keying to navigate.
Now, it just pops on a light then is gone on startup.
a) Why did it start to flicker before it faded?
b) Why does it turn off as soon as it opens now when it obviously can work
c) I bought another flv card in case it wasnt getting power up there (didnt work)
This started happening just after I bought and installed a Utilities program, which I found was nibbling nay chomping vigorously at registry entries. So I dont know if this is software or hardware, or a file that isnt telling it not to turn off thats been corrupted.
Any ideas?

Hello
> I now have a secondary monitor hooked up and programmed to use that as primary. Everything else seems fine
This would mean the graphic card is ok and the problem is just the internal monitor.
In your case I would contact an authorized service provider because the guys can make an exact diagnostic and replace faulty hardware parts. You can find a list of them there:
http://eu.computers.toshiba-europe.com > Support & Downloads > Find an authorized service provider
Dont understand me wrong but here its just an user to user forum and on this virtual way its not possible to fix any hardware problems or replace it. You need professional help.

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