Seeing as how Apple (NASDAQ: AAPL) comprised fully half of Imagination Technologies' (NASDAQOTH: IGNMF) revenue last fiscal year, the Mac maker's decision to ditch the British company in April easily had the potential to be fatal. Though Apple gave Imagination 15 to 24 months of advance notice, which was the time frame that Apple expected it would take to transition to its own internally developed graphics architecture, it's pretty hard to replace half of your revenue.