Table 3-2. Default IRQ Line Assignments (continued)

IRQ Line

Used/Available

 

 

IRQ6

Generated by the diskette drive controller to indicate that the

 

diskette drive requires the attention of the microprocessor

IRQ7

Used by the parallel port

IRQ8

Generated by the system RTC

IRQ9

Reserved for internal system control interrupts

IRQ10

Free

IRQ11

Generated by the CardBus controller and the video controller

IRQ12

Generated by the keyboard controller to indicate that the output

 

buffer of the integrated touch pad or external PS/2 mouse is full

IRQ13

Used by the math coprocessor on the microprocessor

IRQ14

Primary IDE controller

IRQ15

Generated by the secondary IDE controller (CD-ROM drive)

 

to indicated that the drive requires attention of the

 

microprocessor.

 

 

NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary

in the system Help.

Troubleshooting Procedures

This section provides troubleshooting procedures for integrated components (such as the display) and for external devices that connect to the computer (such as an external monitor). Before performing any of the procedures in this section, see “Basic Checks” found earlier in this chapter and read the safety instructions at the front of this guide. Then perform the appropriate troubleshooting procedure for the component or equipment that is malfunctioning.

NOTES: When you see the question “Is the problem resolved?” in a troubleshooting procedure, perform the operation that caused the problem to see if the problem still occurs.

Before you begin any of the troubleshooting procedures, make sure the Quiet Boot option is set to Disabled in the Main menu of the Setup program. See Appendix B, “Using the Setup Program,” for information on using the Setup program.

Troubleshooting a Wet Computer

Liquids, spills and splashes, rain, and excessive humidity can cause moisture damage to the computer. If the computer gets wet or if condensation forms on the computer because of humid conditions, perform the following steps.

3-10 Dell Inspiron 7500 System Reference and Troubleshooting Guide

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Dell 7500 manual Troubleshooting Procedures, Troubleshooting a Wet Computer