HP pavilion xu100 Service Manual

Troubleshooting and Maintenance 
Troubleshooting Your Computer 
 

130 Reference 

Guide 

If the serial or parallel port is not working 

•  Make sure the port connection is secure. 
•  Check the port settings in Control Panel: open the hardware Device Manager, then 

double-click Ports (COM & LPT). 

•  Use the BIOS Setup utility to make sure the serial and parallel ports are enabled—see 

“To run the BIOS Setup utility” on page 135. 

•  Test the ports with the e-Diagtools diagnostics—see “Testing the Hardware” on 

page 133. 

If the USB port is not working 

•  Contact the vendor of the peripheral device or check the HP Notebook web site 

(www.hp.com/notebooks) for the latest versions of the USB drivers and the driver for 
the device. 

•  Check the port settings in Control Panel: open the hardware Device Manager, then 

double-click Universal Serial Bus Controller. 

•  Test the USB port with the e-Diagtools diagnostics— see “Testing the Hardware” on 

page 133. 

Startup Problems 

If the computer doesn’t respond when you turn it on 

•  Connect the AC adapter. 
•  Try turning on the unit by pressing the blue sleep button. 
•  Reset the computer by inserting a straightened paper clip into the system-off switch 

on the left side of the computer. Then turn it on by pressing the blue sleep button. 

•  Don’t touch the pointing stick while booting or resuming. 
•  If the computer still doesn’t respond, remove the battery and AC adapter, remove any 

PC Card, and undock the computer if docked. Then plug the AC adapter in, reset the 
computer using the system-off switch, and turn it on by pressing the blue sleep button.