Startup problem, multiple lined and green screen comes up, no longer can get into safe mode.

Operating a Mac intel with snow leopard 10.6.8
My son was on cartoon enntwork and al of a sudden the screen just fragmented into lines, froze and had bright green areas on it.
I was able to start it in safe mode a few times, but now when I start in safe mode I get the grey screen to blue screen.
While in safe mode I did update the software in the hope that would help. No such luck.
Now I can't get it to do anything.
Any ideas!!
Thanks in adavnce for any help offered..

Book yourself a visit to your local Apple certified service centre. This kind of repair can be done only by pros with coveralls, workbenches, and hardened steel tools.

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http://support.apple.com/kb/HT1939
http://support.apple.com/kb/HT1767
http://support.apple.com/kb/HT1379
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