My first choice is a USB drive since you can purchase a large drive for under $75 these days. Many come with one click software that makes backing up your data a snap. There are many ways to backup with incremental (to go back to a certain point in time) small backups daily and then a full backup weekly. But I digress since this article is about troubleshooting and not backing up data.

Back to the strange noise coming from your computer. Two items to check first, the power supply fan and the hard drive (there could be a third choice on the newer computers since most also have a fan on the processor chip). Both have bearings and spin at high speeds. You normally can determine if the noise is coming from one or the other. Replacing the power supply is not a big deal but can be laborious depending on your computer model and case design. If you’re not handy with a screw driver and understand a little basic structure of positive and negative connections, take it to a local computer repair shop. It’s not difficult but it is easy to make the wrong connection and you can fry your motherboard and everything attached if something goes wrong.

So, you’ve checked the power supply fan and the noise is coming from somewhere else. There are several items inside the hard drive that can cause noise but I won’t bore you with the details. Just suffice to say once the noise starts it’s time for a replacement. Mean time failure these days is 3-5 years on most units. But remember that is based on some daily use value, so it can happen at any time.

The easiest way to replace the hard drive is to buy the exact model, which nobody does since the price point constantly goes down. So instead of a 20 gig drive (that you never filled up), you go for the 120 gig replacement drive. Along with the drive is a CD that has the installation routine for most computers. You have to open the case (make sure the computer is not only off but the power cord is disconnected from the back of the computer) and remove the old drive, carefully replacing the connections in the same manner as the old drive on the new drive. There are only two, one power and one that connects the drive to the motherboard.

Once you have the drive hooked up and the case back together you’re ready to use the installation CD from the drive manufacturer. If your computer bios is set to boot off the CD (which most are since many don’t even have a floppy drive any more) you boot up once and get an error (we need to have power to open the CD unit) and open the CD and place the hard drive installation CD in and close it. Now you reboot and the CD will usually boot up with a menu that allows you to configure the machine and often will ask you for your OS (normally WinXP) CD to start the installation. And therein lies the first possible snafu. You don’t have your WinXP installation CD since your computer came with WinXP on the hard drive.