Something is obviously broken or disoriented and sensitive to shock, like a circuit land or contact point somewhere. If it stays up while stationary but reacts to shock check to make sure the battery contacts have some spring tension and test it with controlled shock testing of your own. Otherwise you're talking about microsurgery.
Read the review by JT.
http://www.roadbikereview.com/cat/training/computers/performance-inc/axiom-8-0-w/prd_19026_1624crx.aspx
You paid, what, $35 for it 13 years ago? Less than $3/year. You got your money's worth. Get a new one. Go wireless. Look on eBay. Read some reviews first.
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