Late 2008 Macbook - broken video card???

hi,

have late 2008 macbook (http://support.apple.com/kb/sp500). however, lately, freezes lot, , when does, there small pink lines running on screen top of screen way down... when restart, however, start normal (though freezes while starting (when apple logo comes on screen).

show video card broken? , if is, possible replace broken video card, or on main board? has nvidia geforce 9400m 256 mb video card.

 

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