When a device in your computer stops working properly it can often be replaced. A simple problem like a bad stick of RAM can cause a host of problems, but it can be easily fixed. CD/DVD drives, video cards, power supplies -- each capable of bringing your system to its knees, none very difficult to replace. Hard disk drives and motherboard repair/replacement can be more involved and more costly. There are also thousands of fun and useful accessories for your computer that can expand your storage space, turn your computer into a video phone, let you take recorded TV with you when you travel and do just about anything else you can imagine.