I recently (about 4-5 months ago) purchased a computer of this model off of the internet. It needed a replacement CR-2032 CMOS battery, so I bought that, and put it in the computer. I had an HDD from 1996 with roughly 1.7GB capacity that I put inside it. The computer booted (partially), and acknowledged the HDD's presence/connection, but at the final phase of booting it said that there was no Operating System detected. What could be the problem? (Take note: I'm a 19-year-old college student, so I'm not very knowledgeable).