Apple MD771LL/A manual Problems with Your Display, No image appears on the screen

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åCheck the AirPort signal level. You may have up to four bars in the AirPort status icon in the menu bar.

åFor more information, see the instructions that came with the wireless device or search for ÒAirPortÓ in Mac Help.

Problems with Your Display

WARNING: If you have a problem with your Apple display and nothing in this manual solves it, contact an Apple Authorized Service Provider or Apple for assistance. If you attempt to repair the display yourself, any damage you may cause to the display will not be covered by the limited warranty on your display. Contact an Apple Authorized Reseller or Apple Authorized Service Provider for additional information about this or any other warranty question.

No image appears on the screen.

åMake sure the display and computer are turned on.

åMake sure the cables are connected properly to your computer and the display.

åIf your graphics card has an internal power cable, make sure its connected to the card and the logic board.

åMake sure your computer is not in sleep. Press the power button or any key to see if the computer wakes.

åMake sure the display brightness and contrast are set properly. Some displays have brightness and contrast controls on or under their front edge.

58Chapter 4 Troubleshooting

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Contents User’s Guide Page Contents Regulatory Compliance Information IndexSetting Up Your Mac Pro Getting StartedPosition your computer and display Plug in the power cord Connect the display Port Connect an Ethernet cable Connect the keyboard and mousePlug the mouse into a USB port on the keyboard KeyboardMouse Use Setup Assistant Need Help Setting Up?Using a Wireless Keyboard and Mouse Turn on your Mac ProPutting Your Mac Pro to Sleep or Shutting It Down Putting Your Mac Pro to SleepShutting Down Your Mac Pro To wake your computer from sleep, do one of the followingGetting to Know Your Mac Pro Getting the Latest InformationBasic Features on the Front of Your Mac Pro FireWire 400 and 800 ports Ports and Connectors on the Back of Your Mac Pro Power socket More Ports and Connectors on the Back PCI Express expansion slots Internal Expansion Options Optical drives More Information Getting AnswersTo open Mac Help Open System Preferences by choosing Apple S ystem Page Working Inside Your Computer Opening the Computer Unplug all the cables and the power cord from the computer Lift the latch while holding the side panel Remove the side panel Installing Memory To install memory Top memory card Working Inside Your Computer Place the side panel in the slot and then push to close Push the latch down to secure the side panel Installing Internal Storage Devices Installing Sata 3 Gbit/s Hard Disk DrivesTo install a hard disk drive Position the connectors towards the rear Replace the side panel and push the latch down to secure it Replacing the Optical Drive To replace the optical driveWorking Inside Your Computer Four extra screws Power cable middle connector Ribbon cable end connector Replace the side panel and push the latch down to secure it Adding PCI Express Cards To install a PCI Express cardAbout PCI Express Cards Port access cover Did You Know?-Installing a Full-Length PCI Card Port access opening PCI Express slotReplacing the Internal Backup Battery To replace the batteryWorking Inside Your Computer Page Problems with Your Mac Pro Computer won’t respond or the pointer won’t moveComputer won’t turn on or start up If that doesn’t work You are unable to eject a discStatus light flashes and the computer won’t start up You have a problem with a software program Problems with SoftwareTo force an application to quit To check for updated software Problems with AirPort Wireless CommunicationKeeping Your Software Up to Date Problems with Your Display No image appears on the screenAfter you change the screen resolution, desktop icons move Screen image appears dim or flickersScreen freezes Problems with Your Internet ConnectionTo use Network Diagnostics Light on the front of the display is flashingCable Modem, DSL, and LAN Internet Connections Turn the modem off and on to reset the modem hardwareCheck System Preferences settings PPPoE ConnectionsNetwork Connections Using Apple Hardware Test To use Apple Hardware TestInstalling Applications Reinstalling the Software That Came with Your ComputerInstalling Mac OS To install Mac OSMaximizing Ethernet Performance System Profiler Learning More, Service, and SupportOnline Resources Onscreen Help Apple Hardware TestAppleCare Service and Support Information Country Phone WebsiteLocating Your Serial Number Processor Processor and Memory SpecificationsRandom-access memory RAM AppendixVideo Display Modes SuperDrive DVD+R DL/DVD±RW/CD-RW SpecificationsGraphics Card Data formatsUSB Specifications FireWire SpecificationsBluetooth 2.0+EDR Specifications Optional Ethernet SpecificationsPower Compatibility AirPort Extreme Specifications OptionalOptical Digital Audio Specifications Optical digital audio outAnalog audio out using the headphone jack typical values Analog Audio SpecificationsAnalog audio line in typical values Power Supply Power Requirements for Expansion Cards and PeripheralsBattery System Clock and BatteryDimensions and Operating Environment DimensionsSafety, Maintenance, and Ergonomics General Maintenance Apple and the EnvironmentTo keep your optical drive working properly Protecting Your Optical DriveMaintaining Your Display To maintain your display and ensure its long lifeImportant Ergonomic and Health-Related Information Forearms and hands in a straight line Avoid Hearing Damage Compliance Statement Wireless Radio Use Korea Mouse Statement Apple and the Environment Disposal and Recycling Information Taiwan European Union-Disposal Information Page Index Index