Using this vintage Apple computer is a bit of a throwback. To start it up, simply plug it in and press the power button. Since it doesn't come with discs, you might need to find some compatible ones to test all its functions. When using it, be aware that due to its age and the replaced hard drive, it may not perform as fast as modern computers. For maintenance, keep it in a clean and dry place. Avoid exposing it to extreme temperatures or humidity. If you notice any strange noises or issues while it's running, it's best to power it off right away and seek professional help. And don't forget that because it's a vintage item, parts might be hard to find if something breaks.