Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to open a desktop computer [title] Check the brand first. [step] If you need to open your computer case for cleaning or repairs, first check what brand of computer you own. Generic desktop computers need to be opened using screwdrivers.

Ending1: See a professional to discuss the brand of desktop computers in your area. [substeps] If you have a bigger computer, ask of people working in retail stores or setting up automatic downloads. Ending2: However, certain brands have buttons or knobs you can use to open the computer case. This eliminates the need for tools, making the process much easier. Ending3: Check the label to make sure it has screwdrivers first. [step] The label will tell you how many screwdrivers are in the case, and vice versa. Ending4: Others produce a lot of ugly and industrial tasting components. Those near new or huge companies also may be able to inspect the case before you begin.

Answer format: ending1/ending2/ending3/ending4