Troubleshooting 51• Ensure that the main power cable and front panel cable are securelyconnected to the system board (see your Service Manual atsupport.dell.com).IF T H E P O W E R L I G H T I S B L U E 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 —• Ensure that the display is connected and powered on.• If the display is connected and powered on, see "Beep Codes" on page 39.IF T H E P O W E R L I G H T I S B L I N K I N G B L U E — The computer is in standby mode.Press a key on the keyboard, move the mouse, or press the power button toresume normal operation.IF T H E P O W E R L I G H T I S B L I N K I N G A M B E R — The computer is receivingelectrical power, a device might be malfunctioning or incorrectly installed.• Remove and then reinstall all memory modules (see your Service Manualat support.dell.com).• Remove and then reinstall any expansion cards, including graphics cards(see your Service Manual at support.dell.com).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 — There is a power problem, a devicemay be malfunctioning or incorrectly installed.• Ensure that the processor power cable is securely connected to the systemboard power connector (see your Service Manual at support.dell.com).• Ensure that the main power cable and the front panel cable are securelyconnected to the system board connector (see your Service Manual atsupport.dell.com).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 connected to the same power strip• Multiple power strips connected to the same electrical outletMemory ProblemsCAUTION: Before you begin any of the procedures in this section, read the safetyinformation that shipped with your computer. For additional safety best practicesinformation, see the Regulatory Compliance Homepage atwww.dell.com/regulatory_compliance.