HP 303B Maintenance & Service Guide: HP 303B Microtower Business PC - Page 57

Solving Power Problems

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Poor performance is experienced. Cause Processor is hot. Hard drive is full. Low on memory. Too many applications running. Solution 1. Make sure airflow to the computer is not blocked. Leave a 10.2-cm (4-inch) clearance on all vented sides of the computer and above the monitor to permit the required airflow. 2. Make sure fans are connected and working properly (some fans only operate when needed). 3. Make sure the processor heat sink is installed properly. Transfer data from the hard drive to create more space on the hard drive. Run the windows disk-cleanup utility to clear some space on the hard drive. Uninstall applications that are not being used. Add more memory. 1. Close unnecessary applications to free up memory. 2. Add more memory. Some applications run in the background and can be closed by right-clicking on their corresponding icons in the task tray. The computer is beeping and will not start. Cause A hardware error has occurred during POST and the computer is beeping a code. Solution See POST Error/Warning Messages on page 42 to interpret the error code. Solving Power Problems Common causes and solutions for power problems are listed in the following table. The computer will not turn on. Cause Cables to the external power source are unplugged. The voltage selector switch on the rear of the computer chassis (some models) is not switched to the correct line voltage (115V or 230V). A defective PCI card has been installed. Solution Check that the cables connecting the computer to the external power source are plugged in properly, and that the wall outlet is active. Select the proper AC voltage using the selector switch. Remove any expansion board that was just installed. Solving Power Problems 49

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Poor performance is experienced.
Cause
Solution
Processor is hot.
1.
Make sure airflow to the computer is not blocked. Leave
a 10.2-cm (4-inch) clearance on all vented sides of the
computer and above the monitor to permit the required
airflow.
2.
Make sure fans are connected and working properly
(some fans only operate when needed).
3.
Make sure the processor heat sink is installed properly.
Hard drive is full.
Transfer data from the hard drive to create more space on
the hard drive. Run the windows disk-cleanup utility to clear
some space on the hard drive. Uninstall applications that are
not being used.
Low on memory.
Add more memory.
Too many applications running.
1.
Close unnecessary applications to free up memory.
2.
Add more memory. Some applications run in the
background and can be closed by right-clicking on their
corresponding icons in the task tray.
The computer is beeping and will not start.
Cause
Solution
A hardware error has occurred during POST and the
computer is beeping a code.
See
POST Error/Warning Messages
on page
42
to interpret
the error code.
Solving Power Problems
Common causes and solutions for power problems are listed in the following table.
The computer will not turn on.
Cause
Solution
Cables to the external power source are unplugged.
Check that the cables connecting the computer to the
external power source are plugged in properly, and that the
wall outlet is active.
The voltage selector switch on the rear of the computer
chassis (some models) is not switched to the correct line
voltage (115V or 230V).
Select the proper AC voltage using the selector switch.
A defective PCI card has been installed.
Remove any expansion board that was just installed.
Solving Power Problems
49