Operating system not found — Contact Dell (see Contacting Dell).IEEE 1394 Device ProblemsEnsure that the cable for the IEEE 1394 device is properly inserted into the device and into the connector on the computerEnsure that the IEEE 1394 device is enabled in system setup — See Entering System Setup.Ensure that the IEEE 1394 device is recognized by Windows —Windows XP:1. Click Start and click Control Panel.2. Under Pick a Category, click Performance and Maintenance® System® System Properties ® Hardware® Device Manager.Windows Vista:1. Click Start ® Control Panel® Hardware and Sound.2. Click Device Manager.If your IEEE 1394 device is listed, Windows recognizes the device.If you have problems with a Dell IEEE 1394 device —Contact Dell (see Contacting Dell).If you have problems with an IEEE 1394 device not provided by Dell — Contact the IEEE 1394 device manufacturer.Keyboard ProblemsCheck the keyboard cable —l Ensure that the keyboard cable is firmly connected to the computer.l Shut down the computer (see Before Working on Your Computer), reconnect the keyboard cable as shown on the setup diagram for your computer, andthen restart the computer.l Ensure that the cable is not damaged or frayed and check cable connectors for bent or broken pins. Straighten any bent pins.l Remove any keyboard extension cables and connect the keyboard directly to the computer.Test the keyboard — Connect a properly working keyboard to the computer, then try using the keyboard.Run the Hardware Troubleshooter — See Hardware Troubleshooter.Lockups and Software ProblemsThe computer does not start upCheck the diagnostic lights — See Power Lights.CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.NOTE: Your computer supports only IEEE 1394a standard.CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.CAUTION: Before you begin any of the procedures in this section, follow the safety instructions that shipped with your computer.