When I turn on my macbook pro is no apple logo, just a black screen

when I turn on my macbook pro is no apple logo, just a blackscreen!
what need i to do! sometimes it wont start up
I used switchsresx for my macbookpro but i removed it becouse it was not working but now when i startup my macbook Pro it shows a black screen!

Here's a link you might find helpful:
http://support.apple.com/kb/ht1564
Safe Boot disables several things, and you can look at the list and see if you can find the culprit. As Linc says, if you still have a problem, post a new topic so that it will get the attention it deserves.

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