Bezel
Top cover
Cover release
latch
4. Lift the cover-release latch. The cover slides to the rear approximately 13 mm
(0.5 inch). Lift the cover off the server.
Attention: For proper cooling and airflow, replace the top cover before
turning on the server. Operating the server for more than 2 minutes with the top
cover removed might damage server components.
5. Press on the bezel retention tabs at the top edge of the bezel, and pull the top
of the bezel slightly away from the server.

6. Lift the bezel up to release the two tabs at the bottom edge of the bezel.

Installing a hot-swap power supply
The following notes describe information that you must consider when installing a
hot-swap power supply in the server:
v The server comes with a minimum of one power supply and supports up to two
power supplies (hot-swappable at 220 V ac only).
v The power supplies are numbered from left to right (1 and 2) as viewed from the
rear of the server. Power supplies must be installed in the following sequence:
power supply 1, then power supply 2.

v A single 110 V ac power supply can support a maximum configuration of one

microprocessor, two PCI-X adapters, three hard disk drives, and four DIMMs. If
you exceed this configuration you must either install a second power supply or
use 220 V ac input.
v If you install or remove a power supply, observe the following precautions:
Statement 8:
24 IBM System x3950 Type 8878 and System x3950 E Type 8879: User’s Guide