Compaq dx7400 Service Reference Guide - HP Compaq dx7400 Business PC - Page 159
Solving Diskette Problems, Solving Power Problems continued
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Table D-2 Solving Power Problems (continued) Power LED flashes Red four times, once every second, followed by a two second pause, and the computer beeps four times. (Beeps stop after fifth iteration but LEDs continue flashing.) Cause Solution Power failure (power supply is overloaded). 1. Check that the voltage selector, located on the rear of the power supply (some models), is set to the appropriate voltage. Proper voltage setting depends on your region. 2. Open the hood and ensure the 4- or 6-wire power supply cable is seated into the connector on the system board. 3. Check if a device is causing the problem by removing ALL attached devices (such as hard, diskette, or optical drives, and expansion cards). Power on the system. If the system enters the POST, then power off and replace one device at a time and repeat this procedure until failure occurs. Replace the device that is causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly. 4. Replace the power supply. 5. Replace the system board. The incorrect external power supply adapter is being used on the USDT. The USDT power supply adapter must be at 135W and use the Smart ID technology before the system will power up. Replace the power supply adapter with the HP-supplied USDT power supply adapter. Solving Diskette Problems Common causes and solutions for diskette problems are listed in the following table. NOTE: You may need to reconfigure the computer when you add or remove hardware, such as an additional diskette drive. See Solving Hardware Installation Problems on page 163 for instructions. Table D-3 Solving Diskette Problems Diskette drive light stays on. Cause Solution Diskette is damaged. Diskette is incorrectly inserted. Drive cable is not properly connected. In Microsoft Windows XP, right-click Start, click Explore, and select a drive. Select File > Properties > Tools. Under Errorchecking click Check Now. In Microsoft Windows Vista, right-click Start, click Explore, and right-click on a drive. Select Properties then select the Tools tab. Under Error-checking click Check Now. Remove diskette and reinsert. Reconnect drive cable. Ensure that all four pins on the diskette power cable are connected to the drive. Solving Diskette Problems 149