3 years old A100-001: horizontal lines when playing games

Dear Everyone!
I have a Satellite A100-001 notebook, almost 3 years old, with 3 GB memory ram, nVidia GO 7600 256 MbRam VGA with rather fresh (6 months old) Windows 7 Professional 32 bit OS.
I use my notebook every day, mostly for work or gameplaying. I never had a problem (and this is why I love Toshiba) until yesterday: when I play, after a few minutes (5-10-15 at most), the screen turns stripped with horizontal lines, and freezes down. Like I said, I never had a problem before.
I don't really know what happened. Could anyone tell me a solution?
I've been thinking of the loss of temp control. I don't really think that the VGA card died (or at least, I hope).
Thanks for you support!

Hi
Hmm the lines on the notebook screen could be related to the graphic chip issue but you should connect an external monitor to be 100% sure that this is a vga related issue and not notebooks monitor problem
But in my opinion its vga issue possibly the graphic chip starts to malfunction due to a higher temperature while gaming what do you think about this theory?
I think you use this notebook long time and maybe the cooling fans dont work properly due to the dust. How about cleaning the cooling module?
Try an compressed air spray. Such tool helps to get rid of dust and debris
Good luck

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