If the problems are intermittent, there may be a loose cable, dirt in the keyboard (if keyboard input is incorrect), a marginal power supply, or
Tother random component failures.
If you suspect that a transient voltage spike, power outage, or brownout might have occurred, reload the software and try running it again. Symptoms of voltage spikes include a flickering video display, unexpected system reboots, and the system not responding to user commands.
Note: Voltage spikes can corrupt or destroy data files on the drive. If you are experiencing voltage spikes on the power line, install a surge suppresser or uninteruptible power supply between the power outlet and the system power supply cords.
If the problem recurs after you have checked and corrected all of the above items, refer to “Additional Troubleshooting Procedures,” next.
Additional Troubleshooting Procedures
The following paragraphs provide a more detailed approach to diagnostic testing and identification of a problem and locating its source.
Use the following troubleshooting procedures to help you identify a problem. These procedures include the following:
preparing the system for diagnostic testing
monitoring POST while it is running
Tverifying proper operation of key system LEDs confirming loading of the operating system.
Preparing the System for Diagnostic Testing
Prepare the system for diagnostic testing as follows.
Note: Before disconnecting any peripheral cables from the system, turn off the system and any external peripheral devices. Failure to do so can cause permanent damage to the system and/or the peripheral devices.
1.Turn off the system and all external peripheral devices. Disconnect all devices from the system except the keyboard and video monitor.
2.Make sure your monitor and keyboard are correctly connected to the system.
3.Make sure the system power supply cords are plugged into a properly grounded AC outlet and the back of the system.
Solving Problems
