HP dx7400 - Microtower PC Troubleshooting Guide

Mouse does not respond to movement or is too slow.
Cause Solution
Mouse may need cleaning. Remove the roller ball cover on the mouse and clean the
internal components.
Mouse may need repair. See the Worldwide Limited Warranty for terms and conditions.
Wireless device error. 1. Check the software, if available, for device status.
2. Check/replace device batteries.
3. Reset receiver and mouse.
Computer is in standby mode. Press the power button to resume from standby mode.
CAUTION: When attempting to resume from standby mode,
do not hold down the power button for more than four seconds.
Otherwise, the computer will shut down and you will lose any
unsaved data.
Mouse will only move vertically, horizontally, or movement is jerky.
Cause Solution
Mouse roller ball or the rotating encoder shafts that make
contact with the ball are dirty.
Remove roller ball cover from the bottom of the mouse and
clean the internal components with a mouse cleaning kit
available from most computer stores.
Table 2-10 Solving Mouse Problems (continued)
ENWW Solving Keyboard and Mouse Problems 31

HP dx7400 - Microtower PC Specifications

General

Memory	Up to 8 GB DDR2 SDRAM
Audio	Integrated High Definition Audio
Power Supply	300W
Processor	Intel Core 2 Duo, Pentium Dual-Core, or Celeron
Storage	SATA Hard Drive
Optical Drive	DVD-ROM, DVD+/-RW
Graphics	Integrated Intel Graphics Media Accelerator 3100
Networking	Integrated Gigabit Ethernet
Expansion Slots	1 PCI Express x16
Ports	1 serial, 1 parallel, audio in/out
Operating System	Windows XP Professional