I am looking for some disk images to burn to a disk that can be used for running hardware checks when there is no hard drive in the computer. Thanks in advance.
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Pick your favorite flavor of Linux and make a LiveCD of it. This will allow you to run Linux on that computer without any install.
You can also use a program like Pendrive Linux to create a bootable USB drive to store your test OS. Pendrive Linux is even set up to automatically download the latest version of several Linux flavors, saving you the trouble of downloading them separately. Running it from a USB rather than a disc also allows you to have some persistent storage, so you can add custom programs and store other data to move between computers you are testing.