- The computer must be turned off. If it is not, please shut it down prior to beginning.
- Press the power button to power on the computer.
- Immediately after pressing the power button, press and hold the [D] button on the keyboard. Continue to hold down the key until the Apple Hardware Test (AHT) icon appears or the Apple Diagnostics (AD) language selection menu loads.
- At this point, the next step will depend entirely on the version of the utility that loads. For AHT, go to step 4a; For AD, go to step 4b.
- 4a. Once the console is fully loaded, using a mouse or keyboard click the Test button or type in T to begin the self-test. If you wish to perform a more thorough test, check the "Perform extended testing" check box before beginning the test. This examination takes longer to complete, but it provides in-depth checking of RAM addresses and Hard Drive sectors for errors.
- 4b. Once the language is selected, the computer will begin the self test, which takes 2-3 minutes on average. When the test is complete, any issues detected will be listed on the subsequent screen. Helpful links to resolving many of these issues may be included, directly from Apple's support site. Additionally, AD uses reference codes to identify specific issues pertaining to hardware and potential failures. These codes can be used to further breakdown a problem or contact Apple technical support directly from AD.
Before choosing what CCTV Camera system to get, sometimes the customers stumble upon the following question: should I choose wired or wireless CCTV camera? What are the pros and cons of wired and wireless CCTV cameras? As you might have guessed, none of the options available are perfect, so it mostly comes down to your personal preferences. But to make your buying decision easier, Have composea comprehensive list of what you can expect from each type of device, both positives, and negatives. Note that a wireless CCTV camera has to be a digital IP Camera, as only digital signal can be transmitted wireless.
Advantages of Wireless CCTV Camera.
1. Easier installation Wireless IP Camera. This is especially important if you want to do it yourself. That way, you will save time and also ensure that you’re going to be capable of doing it in the first place. In a typical scenario, all you have to worry about in terms of installation is having a powe…