How to Do Plus and Minus on a Mac

Check to see if you have the ± symbol on your Mac keyboard. Some Macbooks released in 2009 or later have the symbol on the keyboard above the 'TAB' key. Press 'Shift'+'§' to produce the '±' symbol. If you do not have this key, you can use the universal method.
Hold 'Shift' and then hold 'ALT' (Option).
Press the equals sign (=) key. The three-key combination will insert the ± symbol.
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How to Boot a Macbook With a Clicking Noise

Plug in Macbook to a known good power supply and boot, holding the 'T' key until the Firewire symbol appears on screen.
Connect Macbook to another Firewire-enabled Mac with a 6- or 8-pin Firewire cable, depending on the Mac model. Visually, 6-pin Firewire ports look more rectangular than 8-pin ports.
Select yellow Macbook HD disk icon when it mounts and access user information by opening 'Macintosh HD', then opening the 'Users' folder. User information is contained in the folders therein.
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How to Make an Infinity Sign on an iPod (7 Steps)

Launch the App Store and download an enhanced keyboard that includes glyphs or unicode symbols. Three examples that include an infinity symbol on the keyboard are Fast Keyboard, Glyph-O-Rama and Unicode Pad.
Launch the keyboard app you and locate the infinity symbol. You may have to scroll through several rows of keys depending on how many symbols the app includes. Tap the infinity symbol key when you find it. It appears in the text field above the keyboard. Type any additional symbols or characters you desire.
Tap the text above the keyboard to highlight it. Select 'Copy' from the drop-down menu that appears. Launch any other app like Mail, Notes or the Messages app. Tap the text field where you want the symbol or text you copied to appear and select 'Paste' from the drop-down menu. The text, including the copied infinity symbol, appears in the text field.
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How to Upload Files From Your iPad on Dropbox

Tap the 'Dropbox' app icon on your iPad and enter your login information.
Tap the 'Uploads' icon in the bottom of the left column of the app window.
Tap the '+' symbol at the top-right corner of the left column on the 'Uploads' page. Dropbox will automatically connect to your iPad photo library.
Tap a photo album to select it and then tap the photo you want to upload. Tap the 'Upload' button to send your photo to Dropbox. Dropbox displays a status of your upload in the left column.
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