Make sure to open the computer case if there isn't any warranty void sticker. You don't have to handle any of the boards inside the case. Just take a look and see if any screws holding the cards of motherboard are loose or missing. If you do touch anything inside the computer case make sure to ground yourself properly. This way you will not damage anything with static electricity.
Another good practice before buying anything is to see if you can get a tour of the business you are thinking of buying a product from. Pay close attention of the surrounding areas. Look at the benches where Technicians are working or where someone is building computers for example. Look to see if they are practicing good esd protection. I have seen companies where they are working with carpeting on the bench. Another thing to check is do they have components such as a motherboard right on the Formica Counter top . Another trick I have seen companies use is to have the esd mat on the work surface, but it's not connected or grounded properly. Watch how someone carries a component, do they have it in a esd static bad or are they sandwiching the component in the bag.
Pay close attention to what the person giving the tour says to you. Companies love to make it sound like they are doing tons of business. They will throw out numbers at you as to how much work they put out. Count the items on bench and waiting to be worked on. Look at the number of Technicians working. Do the math and you may realize that they are lying and just trying to impress you and get your business. There are alot of companies that will use these techniques. Once again always protect yourself and your business.
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