Dell 3000 manual Troubleshooting Procedures, Troubleshooting a Wet Computer

Table 3-4. IRQ Line Assignments (continued)

IRQ Line	Used/Available
IRQ12	Generated by the keyboard controller to
	indicate that the output buffer of the inte-
	grated touch pad or external PS/2 mouse
	is full
IRQ13	Used by the math coprocessor on the
	microprocessor
IRQ14	Generated by the hard-disk drive to indi-
	cate that the drive requires the attention of
	the microprocessor
IRQ15	Reserved

NOTE: For the full name of an abbreviation or acronym used in this table, see the Glossary in the online System User’s Guide.

Troubleshooting Procedures

This section provides troubleshooting procedures for built-in 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 Chapter 2, “Cus- tomizing System Features,” 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 com- puter gets wet or if condensation forms on the computer because of humid conditions, use the following procedure.

WARNING: Perform step 1 of the following proce- dure only after you are certain that it is safe to do so. If the computer is connected to an alternating current (AC) power source, Dell recommends turn- ing off AC power at the circuit breaker before attempting to remove the power cables from AC power. Use the utmost caution when removing wet cables from live power.

1.Turn off the computer, and disconnect it from the AC adapter. Then disconnect the AC adapter from AC power. Turn off any attached periph- erals, and disconnect them from their power sources and then from the computer.

2.Remove any installed batteries.

Wipe off each battery, and store it in a safe place to dry.

3.If the options bay slot is wet, remove the device from the bay. If the PC Card slot is wet, remove any PC Cards. Put the device and cards in a safe place to dry.

4.Ground yourself by touching one of the metal connectors on the back of the computer.

5.Turn the computer over, and remove the two screws securing the hard-disk drive.

6.Pull the hard-disk drive straight out of the com- puter. The memory module cover will now lift off.

7.Remove any installed memory modules from their sockets on the system board.

Carefully spread apart the inner metal tabs of the memory module socket just far enough for the mem- ory module to disengage from the socket (the module should pop up slightly). Then lift the mem- ory module away from the socket.

Troubleshooting Your Computer 3-11