HP Edgeline EL4000, Maintenance And Service Manual, Page: 23 / 66

If you must dismount the system or remove a non-hot-plug component, then you must power down the
system.
2. Dismounting the system
If the environment, cabling configuration, or the system location creates unstable conditions, then
dismount the system and place it on a stable surface.
3. Removing the access panel
4. Removing the fixed top cover
Power down the system
About this task
Before powering down the system for any upgrade or maintenance procedures, back up critical system
data and programs.
Before performing chassis maintenance, shut down all cartridges installed in the system.
Procedure
• Use one of the following methods to power down the system:
◦ Press and release the Power On/Standby button of the cartridges installed in the system.
This method initiates a controlled shutdown of applications and the OS before the system enters
standby mode.
◦ Press and hold the Power On/Standby button of the cartridges installed in the system for more than
4 seconds to force the system to power down.
This method forces the system to power down without properly exiting applications and the OS. If
an application stops responding, you can use this method to force a shutdown.
Verify the system is in standby mode and the system power LED is off.
Dismount the system
About this task
Dismount the system, based on the mount installed:
• Dismount the system from a wall mount
• Dismount the system from a rack mount
Remove the access panel
Depending on the configuration of your system, perform one of the following procedures:
• Removing the PCIe access panel on page 23
• Removing the PXIe access panel on page 24
Removing the PCIe access panel
Procedure
1. Using a Torx screwdriver, turn the T-15 locking Torx screw a quarter turn to unlock the latch.
2. Press the latch button and open the latch.
3. Remove the access panel.
Power down the system 23