Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to clean the inside of a dell dimension 5150 computer case [title] Shut down your machine and wait until inside of the case is cool. [step] Take a photo before you disconnect all peripherals if you are a beginner. [title] Remove peripherals.

Ending1: [step] An danish htc removable case may be removed by disconnecting the external connectors and disabling all of the auxiliary connectors. [title] Label the case with its serial number. Ending2: [step] For dell dimension 5150, you do not need a screwdriver to open the case. [substeps] Pull the black bar which is on the top of the case. Ending3: [step] Take out all screws, plates, clamps, etc. Then use a small amount of battery, needle-nose pliers or an electrical tape to separate all components before disposing of them. Ending4: [step] Windows computers have automatic removable access buttons, and removable debars will stay useful when cleaning directly from your computer. Too much touch touch and you could lose them and you could lose one one or both computers.

Answer format: ending1/ending2/ending3/ending4