Dell 900 manual Removing and Replacing the Riser-Board Bracket, Boot-Block Select Jumper

Boot-Block Select Jumper

Figure 2-4 shows the location of the boot-block select jumper (JP7) in your computer. Table 2-5 describes the settings and functions of the boot-block select jumper.

Table 2-5. Boot-Block Jumper Settings

Jumper

Settings Description

Normal boot setting (default). Change this setting only if instructed to by Dell Technical Support.

Boot from top block setting

NOTE: The Glossary in the system Help defines abbreviations and acronyms.

Removing and Replacing the Riser-Board Bracket

Certain system board upgrades require that you remove and replace the riser-board bracket. To remove the riser-board bracket, perform the following steps.

CAUTION: Before you remove the computer cover, see “Safety First—For You and Your Computer” found earlier in this chapter.

1.Remove the computer cover according to the instructions in “Removing and Replacing the Computer Cover” found earlier in this chapter.

2.Remove the riser-board screw (see Figure 2-5).

3.Hold the back of the diskette drive with one hand to prevent it from moving as you perform step 4.

4.Slip one finger into the oval opening on top of the riser-board bracket (see Figure 2-5). Then slightly lift the back end of the riser-board bracket and gently pull the riser-board bracket toward the back of the computer until its front tab is free from the front chassis slot and its two side diskette-drive slots are clear of the diskette-drive tabs.

CAUTION: When handling the riser board bracket, always hold it by plac- ing a finger through the oval opening in the bracket (see Figure 2-5). Do not grasp the bracket by its edges, which may be sharp.

2-10 Dell Dimension 900 System Reference and Troubleshooting Guide