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zt1000/xz300 and xt1500 Series Troubleshooting and Diagnostics 19
Troubleshooting and Self-Repair Guide
• Test the display with the e-DiagTools diagnostics— see “Using the e-DiagTools Diagnostic
Tests” on page 31.
If one or more display pixels look bad
TFT display manufacturing is a highly precise but imperfect technology, and manufacturers cannot
produce displays that are cosmetically perfect. Most, if not all, TFT displays exhibit some level of
cosmetic imperfection. These cosmetic imperfections may be visible under varying display conditions,
and can appear as bright, dim, or dark spots. This issue is common across all vendors supplying TFT
displays in their products and is not specific to the HP notebook display.
HP notebook TFT displays meet or exceed all HP standards for cosmetic quality of TFT displays. HP
does not warrant that the displays will be free of cosmetic imperfections. TFT displays can have a
small number of cosmetic imperfections and still conform to HP’s cosmetic quality specifications,
including the following:
• No more than 6 pixels remain on (always one color, such as white, red, green, or blue dots).
• No more than 6 pixels remain off (always dark).
• No more than a total of 8 pixels stuck on or off.
• No other stuck pixel within 15 mm of a stuck pixel.
Contact HP Customer Care if you have a display quality problem and require a more comprehensive
explanation of HP display quality. We expect that over time the industry will continue to produce
displays with fewer inherent cosmetic imperfections, and we will adjust our HP guidelines as these
improvements are implemented.
Floppy Disk Drive Problems
If a floppy drive connected to the USB port doesn’t work
• Make sure the drive is securely connected to the notebook.
• Restart the notebook: click Start, Turn Off Computer, Restart.
Hard Disk Drive Problems
If the notebook’s hard drive doesn’t spin
• Make sure the notebook has power. If necessary, connect the AC adapter, and make sure it is fully
plugged into a power source and into the back of the notebook.
• Remove and reinsert the hard drive—see “Removing the Hard Disk Drive” on page 40.
If the hard disk makes a buzzing or whining noise
• Back up the drive immediately.
• See whether the noise is coming from elsewhere, such as the fan or a PC Card drive.
If files are corrupted
• Check the hard disk: open My Computer, select the disk you want to scan, click File, Properties,
and use the Tools tab.
• Run the Norton AntiVirus program.