Below are some of most commonly asked questions I receive.
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No. You must take the machine to an Apple Store, contact Apple or an Apple Authorized repair center. I will do not repairs on Macs under warranty, as it violates the terms and conditions of the warranty. Once the period is over; I do repairs.
Credit, check, cash. Payment is expected upon completion of service.
In general, my answer is yes. There's a couple of caveats: If you are just doing web browsing and writing, you may not need more than 4 GB, or even less. If you are using a lot of programs simultaneously, or if you are doing high-level graphic design or running multiple programs continuously, increasing your RAM will speed up your computer and reduce stress on your hard drive.
There are differences of opinions among computer experts on this topic. My opinion is YES, it should be shut down when not in use. The reason is your components need down time to cool off and they also accumulate less dust when they are off. Electronic charge attracts dust. The process of shutting down and starting your computer does a lot of important housekeeping on your computer, and although you need me less because of this, I still recommend turning it off. Also, even in sleep mode, computers draw a surprisingly large amount of electricity, so not only is it GREEN to turn off, it also helps insulate you from unexpected surges in your power supply.