Troubleshooting checklist
Before running diagnostic utilities, make sure that.
●The computer is connected to a working electrical outlet and powered on, and the power light is illuminated.
●The monitor (for tower or desktop configurations) is connected to a working electrical outlet and powered on, and the power light is illuminated.
●The monitor brightness and contrast are properly adjusted.
●The keyboard is operating correctly (press and hold any key and listen for a beep).
●All cables are properly connected.
●All necessary device drivers are installed
●All external media (such as optical disks or USB drive keys) are removed before startup.
●The latest version of BIOS, drivers, and software are installed.
120 Chapter 4 Diagnostics and troubleshooting
