Dell Dimension 2350 - Manual (Page 28)

8. Lower the heat sink to the microprocessor so that the heat sink fits in the retention base.
9. For each of the replacement securing clips, fit the end of the clip that does not have the latch over the tab on the retention base. Then, press down on
the securing clip's latch to secure the clip to the retention base.
10. Lower the heat-sink shroud.
11. Replace the computer cover .
12. Connect your computer and devices to electrical outlets, and turn them on.
If you are installing a microprocessor replacement kit from Dell, return the original heat-sink assembly and microprocessor package to Dell in the same package
in which your replacement kit was sent. Your microprocessor replacement kit should include a replacement microprocessor heat sink and one replacement
securing clip.
Replacing the System Board
Removing the System Board
1. Shut down the computer through the Start menu.
2. Ensure that your computer and attached devices are turned off. If your computer and attached devices did not automatically turn off when you shut
down your computer, turn them off now.
3. Disconnect any telephone or telecommunication lines from the computer.
4. Disconnect your computer and all attached devices from their electrical outlets, and then press the power button to ground the system board.
5. Remove the computer cover .
6. Remove the floppy drive .
7. Remove any cards that are installed.
8. Disconnect all cables from the system board.
9. Lift up the heat-sink shroud.
10. Remove the microprocessor heat sink .
11. Remove the 12 screws that secure the system board to the computer frame.
Four of the 12 screws that secure the system board to the computer frame also secure the heat-sink base to the system board.
NOTICE: To connect a network cable, first plug the cable into the network wall jack and then plug it into the computer.
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions provided in your Owner's Manual.
NOTICE: To disconnect a network cable, first unplug the cable from your computer and then unplug it from the network wall jack.
CAUTION: To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE: Before touching anything inside your computer, ground yourself by touching an unpainted metal surface, such as the metal at the back of the
computer. While you work, periodically touch an unpainted metal surface to dissipate any static electricity that could harm internal components.
CAUTION: The microprocessor heat sink can get hot. To avoid burns, ensure that the heat sink has had sufficient time to cool before you touch it.