Dell Dimension U7021 Owner's Manual

Contents

Dell Dimension U7021 Owner's Manual Manual pdf 46 page image

46 Solving Problemsw w w . d e l l . c o m | s u p p o r t . d e l l . c o mPower ProblemsCAUTION: Before you begin any of the procedures in this section, follow the safety instructionslocated in the Product Information Guide.IF T H E P O W E R L I G H T I S G R E E N A N D T H E C O M P U T E R I S N O T R E S P O N D I N G — See "Diagnostic Lights"on page 53.IF T H E P O W E R L I G H T I S B L I N K I N G G R E E N — The computer is in standby mode. Press a key on thekeyboard, move the mouse, or press the power button to resume normal operation.IF T H E P O W E R L I G H T I S O F F — The computer is either turned off or is not receiving power.• Reseat the power cable into both the power connector on the back of the computer and the electricaloutlet.• If the computer is plugged into a power strip, ensure that the power strip is plugged into an electricaloutlet and that the power strip is turned on. Also bypass power protection devices, power strips, andpower extension cables to verify that the computer turns on properly.• Ensure that the electrical outlet is working by testing it with another device, such as a lamp.• Ensure that the main power cable and front panel cable are securely connected to the system board (seepage 75).IF T H E P O W E R L I G H T I S B L I N K I N G — The computer is receiving electrical power, but an internalpower problem might exist.• Ensure that the voltage selection switch is set to match the AC power at your location (if applicable).• Ensure that the processor power cable is securely connected to the system board (see page 75).IF T H E P O W E R L I G H T I S S T E A D Y A M B E R — A device might be malfunctioning or incorrectly installed.• Remove and then reinstall the memory modules (see page 76).• Remove and then reinstall any cards (see page 79).• Remove and then reinstall the graphics card, if applicable (see page 84).EL I M I N A T E I N T E R F E R E N C E — Some possible causes of interference are:• Power, keyboard, and mouse extension cables• Too many devices on a power strip• Multiple power strips connected to the same electrical outlet