Lock screen and mouse L850 satellite every 2 seconds

I think I have a hardware problem with the Satellite PSKDLA - 0C800R L850.

It is a laptop I bougth to my wife but he has ended up with my stepson of Uni studies. While he had it the hard drive is not one of his friends replaced. twelve months later, he advised it was gone blackscreen and G'nort would turn out.

I finally got hold of it again and managed to drain the power remaining and replaced the CMOS battery remove a strip of RAM and it starts fine. I've proved a faulty stick so that left aside. Then I realized that there was a problem with the screen and the mouse

. The screen would brighten up (wash out) then Flash and stabilize. First thought was video chip or the driver.
At the same time would lock the mouse. When the screen clears the mouse would again.
Happening every three or four seconds but now every two seconds. It is more difficult to do something.

Have reloaded many drivers, but I think it is material, but not sure if it needs a motherboard or processor.
Can you advise?

I forgot to mention that the image of the screen is slightly down from senior management.
Tere is a few millimeters of black with a white line on the top edge of the image.
This white line seems to come on and off with the locked mouse synchronization and the screen. This is another indication of the problem or the backlight?

Hi, have you checked the thermal paste between the CPU and the heatsink?
CPU fan blows hot air outdoors?

Tags: Toshiba

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