http://support.apple.com/kb/HT3746
Also some information to consider when posting here:
The following is taken from the thread titled "
How to maximise your MacRumors troubleshooting experience" created by mad jew in 2006. It contains more elaborate information on the short extracts I took from it and should help you in finding appropriate help.
I also made some additions after finding that thread.
- Search for threads or guides containing similar problems.
MRoogle is quite a good tool to search these forums.
- Start your thread in the appropriate forum or sub-forum.
Here is the forum's main page with the list of all the sub-fora found here.
- Use a specific and descriptive thread title.
"Need help!!!!???? ASAP!!!" and its variants are not specific.
- Find and post machine hardware and software configurations.
You can find out more about your Mac by going to the Menu Bar >
> About This Mac > More Info ... (this button opens Applications / Utilities / System Profiler) > Hardware Overview.
- Tell us your problem, and be specific. What is happening to your machine?
What Mac OS X version and what Mac do you use, ... .
- How long has this been happening? What changes were made just before this started?
- What have you already tried?
- Respond to all posted advice with details of what happened.
- Be wary of the (very) occasional bad advice.
- Be patient.
- Be courteous.