White apple logo screen does not appear instead screen is black. Eventually boots to login screen. Slower startup.

When I turn on my MacBook Pro 15 inch 2011, the screen does not turn on until login. Also startup is slower than usual.
I turn on the computer and it makes the optical disk noise.
The screen reamains black until the login window appears
White apple logo screen is missing.

Greetings,
Reset the SMC and then test: http://support.apple.com/kb/HT3964
Reset the PRAM and then test: http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html
If the issue persists follow: http://support.apple.com/kb/TS2570
Cheers.

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White apple logo screen does not appear instead screen is black. Eventually boots to login screen. Slower startup.

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