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HP Compaq dc7800 Ultra-slim Desktop PC - Removing and Replacing the Access panel

This document pertains only to HP Compaq dc7800 Ultra-slim Desktop PCs with the following case design:
Before you begin
  • Turn off the computer, and then disconnect all cables. Disconnect the Ethernet or modem cable before disconnecting the power cord.
  • Move the computer to a clear, flat, stable work surface over a non-carpeted floor.
  • HP strongly recommends the use of an anti-static wrist strap and a conductive foam pad when working on the computer.
  • Do not remove a component from its protective packaging until you are ready to install it.
  warning:
The edges of metal panels can cut skin. Be careful not to slide skin along any interior metal edge of the computer.
  caution:
This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.
Video overview (in English)
To view a video demonstrating the procedure for removing the access panel, right-click Access panel removal video and select Open link in new window/tab.
Replacement part information
The following HP part numbers are known to be compatible with this system:
  note:
Part numbers are subject to change.
Description
Part Number
Requires Return
Top access panel - Provides access to the inside of chassis.
451387-001 (Modified)
No
* If a part is listed as "Yes" under "Requires Return" then the defective part needs to be returned to HP. For more information about returning parts to HP select one of the links below:
  note:
For customers in countries/regions with RoHS legislation* (e.g. EU, China, etc.) restricting the use of hazardous substances in electrical equipment. The use of the Original Spare part is regulated by RoHS legislation. If your unit contains a part that is labelled with the Modified Spare number, the Modified Spare must be ordered as the replacement part. If your unit contains a part that is labelled with the Original Spare number, please order the Original Spare as the replacement part. In this case either the Original Spare or the Modified Spare may be shipped which will not affect performance or functionality of the unit.
Access panel removal
  caution:
Review the following safety considerations before performing the following steps. Failure to comply with these safety considerations could result in damage to the product.
Step 1
Remove the cable lock and/or padlock, if they are installed.
Step 2
Loosen the captive thumbscrew that secures the access panel.
Step 3
Press on the access panel and slide it forward about half an inch.
Step 4
Lift the panel away from the chassis.
Access panel replacement
Step 1
Position the access panel over the chassis about half an inch beyond the front of the computer so that the tabs on the access panel align with the slots on the chassis guide rails.
Step 2
Press on the access panel and slide it back until it is flush with the front bezel.
Step 3
Tighten the thumbscrew.

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