22Caution:Whenever you open the case or work inside the computer there isdanger of static electric shock. These shocks can permanentlydamage your equipment. Always ground yourself by touching thesystem cabinet before touching any internal component. Westrongly recommend using an antistatic wrist strap attached tocabinet ground.How to Open a Mini-Tower CaseOpening a mini-tower case is similar to opening a tower case.To open a mini-tower case:1. Turn off the monitor and system unit power. Unplug the AC powercables and disconnect any other cables attached to the back of thesystem unit.2. Remove the four mounting screws at the back of the case thathold the case cover to the system unit chassis.3. Slide the case cover back and up, taking care not to snag anycables or connectors inside.4. Set the case cover aside while you work on your system.5. Afterwards, reattach the case cover, screws, and cables in reverseorder.To remove the mainboard tray:1. Remove the case cover (see above).2. Remove all cables and connectors binding the mounting plate tointerior components.3. Remove the tray’s four retaining screws (see opposite).4. Carefully slide the tray out, checking for stray connectors.Chapter 1 - The Big Picture