Flashing / Blinking screen on Qosmio F50

Hello,
I've a persistent problem with my F50-12L screen, suddenly the screen flashing/blinking/display brightness goes up and down suddenly (This is not dim, it happens when I'm working as well)
When I start up my laptop, everything is smooth and working fine, suddenly it start to blink/Display brightness goes up and down and blinking for seconds then it disappear and back to normal again! I'm using the latest drivers and latest 2.2 bios and OS is win7 ultimate 32bit.
I took it twice to the authorized dealer/support here in Egypt which called Toshiba El-Araby : http://toshiba.elarabygroup.com , every time they say nothing wrong with it !! I check it before leaving and everything is fine and I keep telling them it's happening all the time, it just doesn't happen in front of them(is it my fault? lol), and back to home, and test it, it may run for hours without blinking etc, but suddenly, it starts to do so again for a while and disappear, and so on...
I thought it's an issue with the adapter, It's happening also when I'm working on battery, and I tried to remove the battery and work on the adapter directly(to check if there is nothing wrong with the battery) and it happened again.
Also, I tried to change my power mode, I tried all of them: High perf, balanced & power save modes, It''s happening whatever mode I use.
* Sometimes when it happens, there is a sound hmm i dont know the source of the sound but it seems to be the fan!(not sure, weird low sound! it's like zzzzz) I tried to adjust the screen and the flashing/blinking disappears, but it doesnt help all times, is there any issue with the screen itself?
I got tired of this, and of this support agent here in Egypt as I can't drive for 2 hrs everyday for nothing usefull, and Its hard for me to leave the laptop for days every week when it happened.
Anybody faced such issues with screen being flashing/blinking like mine? Do you have ideas or suggestions regarding this? Does Toshiba provide direct email support? I coudn't find their technical support email, If so, I would appreciate providing me with it and any help is much appreciated.
Sincerely,

Macius ,
Thanks for your reply and sorry for the delay. I was unable to login to this forum and it kept saying no user name, however I've managed to login now after many tries of resetting password.
I've tried to connect it to an external monitor, not doing the same with external monitors(it doesn't blink/flash when I connect it to an external monitor) Also when it flash/blink I adjust it by my hand and it disappear and return again and so on and it's annoying.
Do you or anyone has an explanation to this please? Plus, When it flash/blink, there is a weird low sound comes along with it zzzzz
I'm planning to take it to the Toshiba agent here in Egypt on Next Sunday, But i will appreciate any inputs that can spot or clarify this issue as it may help me to explain it better to the tech support at Toshiba as they are running in a closed circle for over a year.

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> Often the screen goes absolutely dim. I can see a very very faint image if I concentrate very hard. External monitors when connected stay well lit and bright.
> My question is how do I find out whether it is the VGA cable or the inverter and where do I buy the part from!
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