Power Supply - Dell Precision WorkStation 420 Service Manual

15. Test the hard-disk drive by running the Dell Diagnostics (see the online System User's Guide for more information).
16. If the drive you just installed is the primary drive, install your operating system on the hard-disk drive.
Refer to the documentation that came with your operating system.

Power Supply

To access some components on the system board, you may have to rotate the system power supply out of the way. To rotate the power supply,
perform the following steps.
CAUTION: Before you remove the computer cover, see
1. Remove the computer cover as instructed in
2. Disconnect the AC power cable from the AC power receptacle on the back of the power supply (see
Figure 20. Rotating the Power Supply
3. Free the power supply by pressing the securing tab labeled "RELEASE" and rotate it upward to a vertical position. See Figure 20.
To remove the power supply, perform the following steps.
CAUTION: Before you remove the computer cover, see
Figure 21. Removing the Power Supply
1. Remove the computer cover as instructed in
2. Disconnect the AC power cable from the AC power receptacle on the back of the power supply.
3. Disconnect the DC power cables that attach to the diskette drive, any installed 5.25-inch drives, and hard-disk drives mounted in the
internally-accessible drive bracket.
"Precautionary
"Computer Cover."
1 Securing tab
2 Power supply
3 Release latch
"Precautionary
1 Power supply
2 Slot
"Computer Cover."
Measures."
Figure 20).
Measures"