|DPS-91AB-3 seems to be the part number for a Compaq PSU, not the computer model. See this: http://www.impactcomputers.com/dps-...|
That would explain why you (and I) cannot find any information on it as a computer.
Usually, whenever I type a valid model number of a Compaq/HP computer model, the relevant HP description page is at the top of the search results list. Doesn't work with that number so I'm guessing it's not a valid PC model number.