System board, Replacing the power supply, Removing the system board – Dell Precision 390 User Manual
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5.
Slide the power supply toward the front of the computer by approximately one inch.
6.
Lift the power supply out of the computer.
Replacing the Power Supply
1.
Slide the power supply into place.
2.
Replace the four screws that secure the power supply to the back of the computer chassis.
3.
Reconnect the DC power cables.
4.
On the desktop computer, reattach the power cables to the side of the hard drive.
5.
Run the cables underneath the tabs, and press the tabs to close them over the cables.
6.
Replace the computer cover. See
7.
Connect your computer and devices to electrical outlets, and turn them on.
System Board
Removing the System Board
1.
.
2.
Remove the computer cover (see
).
1 power supply screws (4)
NOTICE:
To connect a network cable, first plug the cable into the network port or device and then plug it into the computer.
CAUTION:
Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.
CAUTION:
To guard against electrical shock, always unplug your computer from the electrical outlet before opening the cover.
NOTICE:
To prevent static damage to components inside your computer, discharge static electricity from your body before you touch any of your
computer's electronic components. You can do so by touching an unpainted metal surface on the computer.
NOTICE:
The system board and metal tray are connected and are removed as one piece.