Build a tower, or buy and "destroy"?

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http://ubuntuforums.org – Hello all: I joined this forum to seek a little advice. I've been running Ubuntu, first 11.10, and then 12.04 for almost a year now a love it. The OS works excellent on my Dell Inspiron Laptop (E1505) which would have been trashed in the garbage (as most Microsofters do when it had a virus and I could not find recovery disks) but Linux saved the day! My other computer is a tower I build 10 years ago. I upgraded it some, ie. the Ram to 1 GB and replaced a bad motherboard, but the video card is 10 years old. Although Ubuntu runs fairly well on that system, therein is where my problem lies. (Hardware)