Troubleshooting

Apple Knowledge Base: Generally the first place to look for very common issues. Apple posts information on solutions or explanations.

Apple Discussion: This is where you can search for issues that others have experienced and see the solutions other Apple users have provided.

Apple Specifications: This is where you can find the original specifications of various Apple products. This is especially useful if you want to know what upgrades you can do to your computer. i.e. How much Memory can my computer hold?
Apple Manuals

Installing Memory: Find instructions to installing or replacing memory in most current Mac models.