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CHapTER 30
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Troubleshooting Hardware, Driver, and Disk Issues
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outside of the computer . Particularly with mobile PCs, verify that the computer is not resting on a soft surface that can prevent heat dissipation, such as a couch or carpet . Finally, reset processor and memory speeds to their default settings to verify that the computer has not been overclocked .
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How to Check the Configuration of Your Hardware
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If you have recently changed the hardware configuration of your computer, or you are configuring a new computer, you should check the configuration to identify the cause of a startup problem .
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Verify that you correctly configured any jumpers or dual in-line package (DIP) switches Jumpers and DIP switches close or open electric contacts on circuit boards . For hard disks, jumper settings are especially important, because they can adversely affect the startup process if not correctly set . For example, configuring two master Advanced Technology Attachment (ATA) disks that are installed on the same channel or assigning duplicate small computer system interface (SCSI) ID numbers to devices in the same SCSI chain might cause a Stop error or error messages about hard disk failure . Configure boot configuration data (BCD) references correctly when a hard disk is added Installing an additional hard disk or changing the disk configuration in a computer can prevent Windows from starting . In this case, use the Startup Repair tool within System Recovery tools to automatically resolve the problem . For more information, see 29 . Verify SCSI configuration If your computer uses or starts from SCSI devices and you suspect that these devices are causing startup problems, you need to check the items listed in Table 30-2 .
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TABlE 30-2 Checklist for Troubleshooting SCSI Devices
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ITEM
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All devices are correctly terminated .
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Verify that devices are correctly terminated . You must follow specific rules for termination to avoid problems with the computer not recognizing an SCSI device . Although these rules can vary slightly from one type of adapter to another, the basic principle is that you must terminate an SCSI chain at both ends . Verify that each device located on a particular SCSI chain has a unique identification number . Duplicate identification numbers can cause intermittent failures or even data corruption . For newer devices, you can use the SCSI Configured AutoMagically (SCAM) standard . The host adapter and all devices must support the SCAM standard . Otherwise you must set ID numbers manually .
All devices use unique SCSI ID numbers .
How to Diagnose Hardware Problems
CHapTER 30
ITEM
DESCRIPTION
The BIOS on the startup SCSI controller is enabled .
Verify that the SCSI BIOS is enabled for the primary SCSI controller and that the BIOS on secondary controllers is disabled . SCSI firmware contains programming instructions that allow the computer to communicate with SCSI disks before Windows 7 starts . Disabling this feature for all host adapters causes a startup failure . For information about disabling or enabling the BIOS, refer to the documentation provided with your SCSI controller . Verify that the connecting cables are the correct type and length and are compliant with SCSI requirements . Different SCSI standards exist, each with specific cabling requirements . Consult the product documentation for more information . Verify that host adapter BIOS settings for each SCSI device are set correctly . (The BIOS for the SCSI adapter is separate from the computer motherboard firmware .) For each SCSI device, you can specify settings such as Sync Negotiation, Maximum Transfer Rate, and Send Start Command that can affect performance and compatibility . Certain SCSI devices might not function correctly if settings are set beyond the capabilities of the hardware . Consult the documentation for your SCSI adapter and device before changing default settings . Verify that you installed the host adapter in the correct motherboard slot . The documentation for some PCI SCSI adapters recommends using busmaster PCI slots to avoid problems on 32-bit computers . Refer to the manufacturer s documentation for your motherboard or computer to locate these busmaster PCI slots . If your SCSI adapter is installed in a non-busmaster PCI slot, move it to a master slot to see whether the change improves operation and stability .
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