The Mac Mini Won't Turn On (6 Steps)

Remove all USB cables from the Mac Mini, including the power cable.
Allow 10 seconds to pass, and simultaneously insert the power cord while holding down the power button on the Mac Mini. The power button is located on the back of the computer.
Release the power button, then press the power button again to turn on the computer. Plug in the cables that connect the keyboard and monitor to the computer to test if your Mac Mini starts up normally. According to Apple, your Mac Mini's date and time will be reset in the process and must be re-synced through the Date and Time preferences in your System Preferences.
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How to Crop Something From the Web on MacBook

Open a Web browser, then go to the website with the element that you want to crop.
Open the 'Grab' utility in the Utilities folder.
Press Command, Shift and A simultaneously on the keyboard.
Drag the cursor over the area of the Web browser to crop it into an image. When the mouse button is released, the selection from the Web has been cropped.
Press Command and S simultaneously to save the image to a file. After it is saved, it can be further manipulated with other software, or sent in an email.
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How to Restore a Custom iPhone IPSW

Back up your crucial iPhone data.
Open iTunes. Connect your iPhone to your computer using the iPhone USB cable.
Hold the 'Home' and 'Sleep' buttons down simultaneously for 10 seconds.
Release the 'Sleep' button immediately after 10 seconds are up. Continue to hold down the 'Home' button. If done successfully, iTunes will display a dialog window informing you that it has detected an iPhone in recovery mode. Click 'OK' and you are taken to the iPhone restore page. The timing is tricky and it may take a few tries.
Hold down 'Control' (or 'Option' on a Mac) and click 'Restore.' This will bring up a file browser. Locate the custom IPSW firmware and click 'Open.' iTunes will begin restoring the iPhone using the custom firmware. A progress bar will indicate how far along the process is and a progress bar will also display on the iPhone. A confirmation dialog will inform you of the successful restore.
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How to Forcibly Quit a Program in MacBook (6 Steps)

Hold down the 'Command-Option-Esc' keys on your keyboard simultaneously to open the Force Quit Applications window.
Highlight the program in the list that you want to forcibly close.
Click the 'Force Quit' button in the lower right corner of the Force Quit Applications window.
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