Satellite S2450-202 - multicolored flashing pixels

Hello world
I have big problems with my Satellite S2450-202.

Now it hangs whenever he feels like it, sometimes after a few minutes, sometimes after an hour.
When I turn it on it starts as normal and load my normal desktop page then without warning the screen freezes and I get multicolored flashing and the displacement of pixels which change to the smaller pixels white/gray/black, forming lines on the screen. If I leave it alone, it restarts finally saying that the computer is not stopped correctly and begins with the tool running and checking the status of the disks disk check to find errors, but do not find anything.
I have not loaded something new or changed settings, the laptop is now completely unusable as it is.
Can someone help me?

I am running windows xp service pack 3
The notebook computer is a Pentium 4 2.80 ghz with 512 MB ram with 420 graphics from nvidia ge force.

This model of laptop must be 7 years old and I m did not ask something like this starts happening after so long.
It is not easy to say what the problem is here, but I guess it must be because of malfunctioning of the graphics card.
To verify this connect external screen to the laptop, desktop to external display only switch and check what is happening here. If the same thing happens again it's graphics card problem without a doubt.

Tags: Toshiba

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