I was afraid of that. I started to run the dos but wasn't sure which choice. You had mentioned in an earlier comment that you tried from memory to walk me through (see quote below), but when I tried it, I did not find the western digital diagnostics choice. I'll be glad to try it, if you steer me in the right direction.
Also, I've been thinking of upgrading this computer anyway. This site helped me build it several years ago and I was thinking of asking for help to make some changes (i.e. ss hd, new video card, motherboard, etc.). I'll post the question in the correct section, but am interested in your opinion. Money is not an issue.
"Dos tools, hard drive utilities, western digital diagnostic. From memory so hopefully it's right. At work currently can help later today though."