Screen dies under boot - everything else works

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im having strange problem cant find alike on google - sorry if theres thread covering problem?

when boot imac 24" (november 2008 - specs can give now) apple logo , wheel comes on - wheel turning , seems fine - wheel animation stops , screen "freeze" on image, tough system keeps loading , works fine - pressing play on keyboard 2 times make itunes burst music!

so, seems shift between load screen , contact system somehow isnt happening - didnt install, update or in anyway alter system last time shut down...

i´ve tried div. bootmodes without success - can run imac in target disc mode , on disk looks fine.

2 things remains me try yet - try secondary screen after complete bootup - try reinstall system if first option works (rather wait , hear if has solution)

suggestions troubleshooting?

 

it sounds may have gpu problem. if have original disks can run aht's (apple hardware tests) details on how in link below:

http://support.apple.com/kb/ht1509


can eliminate hardware equation, , second display option idea.
 


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