I need help my late 2007 imac will go black after I start it up ?

i Start the computer up it shows the grey aand the apple shows. it loads and then goes black and the cursor still shows. I was thinKing my graphics cards was shot But I booted it in recovery mode and to shows all the colors and acts like nothing's is wrong. Any idea?

You need to methodically follow the steps in Gray screen appears during startup
If the machine doesn't work after the final step Apple advises to take it in for repair. You can still run Apple's Hardware Test in Extended Mode 2-3 times back to back, if errors appear then that confirms it is hardware but will not tell you what is wrong exactly.
If it does turn out to be hardware you may want to consider replacing it, after all it's close to 8 years old.

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    To learn more about your new Mac, I recommend this link: http://www.apple.com/support/imac/intel/
    And this book: http://www.amazon.com/books/dp/0789749890
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