Power On, Apple Logo, Grey Screen (2005 macbook pro)

Ah what's wrong with it
When I turn on my laptop, the normal apple logo and loading spinner pop up, and when they go away, I'm just left with a grey background. Whas going on

Gooseberrysoda wrote:
However, now that it's booted up, Airport can't turn on,
Some things may be disabled in Safe Mode:
http://docs.info.apple.com/article.html?artnum=107393
Also, my cursor has 15 horizontal lines on it... I have no idea what that means. They extend from the cursor itself and continue down in a line, about 4x15 pixels each.
Sounds a lot like a GPU issue. Run Apple Hardware Test to see what it shows.

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