Re: screen switches from application back to desktop
Open your System Preferences. Go to Dashboard & Expose. This is a very helpful application in my world. Whenever you want to see all the windows, hide windows, start screen saver, you just push your mouse into the appropriate corner. Sounds like you have a corner set and when you hit it, you trip the effect. Change the corner and check them out, Handy to use when you have multiple windows open. Experiment and see.
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Print Screen in Mac OS X Unlike Windows, there is no print screen button on the Apple keyboard. Depending on what you want to capture, you can choose one of the following methods to simulate a print screen. Capture the entire screen Press [Command] + [Shift] +  and release. Click any part of the screen with your mouse. The screen capture is stored on your desktop in .PNG format.
Capture an application Open the application you want to capture on screen. Press [Command] + [Shift] +  and release. The cursor will change to a +. Press the [Spacebar] The cursor will change to a camera. Use the mouse (camera) to select the application. Check your desktop for the picture.
Capture a portion of the screen Press [Command] + [Shift] +  and release. The cursor will change to a +. Drag your mouse (+) to select the area you want to capture . Check your desktop for the picture.
TIP:To copy the image on your clipboard instead of automatically saving it on the desktop, hold the [Ctrl] key along with [Command] + [Shift] + .
Show Hidden Files in Mac OS X Open the Terminal application. You can find it under Applications -> Utilities. Type defaults write com.apple.finder AppleShowAllFiles Yes. Launch the Finder to see the hidden files. They are pre-fixed with a dot(.). Please be careful while changing anything in these files. The OS X uses them to manage the Mac.
Useful shortcuts Use [Command] + [Space] to open the Spotlight search bar. Use [Command] + [Option] + [Del] (Delete) to empty trash. Use [Command] + [Q] to quit an application. Use [Command] + [Option] + [Ctrl] +  to invert the colors on your Mac.
Dock Tips Add an already open application to the dock: Press [Ctrl] + mouse click. From the context menu, select “Keep in Dock” Add a closed application to the dock: Drag it from the Finder to the Dock. From the context menu, select “Keep in Dock” Remove an application: Drag the item off the dock and it will disappear in the cloud of smoke From the context menu, select “Keep in Dock” Resizing an application: Place the cursor over the vertical separator bar and right click the mouse.
Automator Basics The Apple Automator application allows Mac OS users to automate the repetitive computer tasks by creating a workflow. A workflow is a series of actions that will be executed one after the other when executed. An action is the simplest unit of the Automator like Copy to Clipboard By combining actions from different applications in the drag and drop interface of the Automator, you can create your own applications and plug ins. Here is how it works.
Open Automator.app from the Applications folder.
You will see 4 panes: Library, Action and Help on the left; the workflow canvas on the right.
You can search for actions by typing in the edit box located on the top left corner of the application.
Create a plug in for sending mail from the Finder
Press [Command] + [N] to create a new workflow.
Select Finder in the Library list.
Select Get Selected Finder items.
Drag it to the workflow canvas on the right.
Now select Mail application in the Library List.
Select Get New Mail.
Drag it to the right window, below the Get Selected Finder Items box.
Select the Add Attachment to Front Message from the Action pane and drop it as the last action on the workflow.
You have just completed your workflow.
Click the Run button on the top left corner of the screen.
The Mail app will pop up. Close it and go back to the Automator application
Open File > Save as a Plug-in. Type a name for the Automator plug-in.
Open the Finder window and click on a file that you would like to send as an email attachment.
From the context menu([Ctrl] + click), select Automator and then choose the workflow you just created.
If you have your mail account set-up, you just need to type in the details of who you want to send the message to. You can now send attachments directly from your Finder window.
You may have changed the screen resolution to a higher setting, (which is not always a bad thing so long as you can see it properly)-- try opening System Preferences (probably in the dock in the lower right-- but if not, it is located in the Utilities folder, which is inside the Applications folder) and open the Displays pane. Here, you can adjust your screen resolution to a lower ("bigger") setting, i.e. one of the options closer to the top of the list.
just restore your computer to a couple of weeks ago.just go to the control panel.click performance and maintenance.then in your left hand corner you should see system restore. follow the steps and be sure to click on the date before this occured.good luck,hope i helped
open the applications folder go to utilities folder open program called disk utility select the main disk in the list on the left and click repair disk permissions if that doesn't work please send me the error message