I had been doing Tech Support for Hewlett-Packard's DeskJet division for about a month when I had a customer call with a problem I just couldn't solve. She could not print yellow. All the other colors would print fine, which truly baffled me because the only true colors are cyan, magenta, and yellow. I had the customer change ink cartridges，delete and reinstall the drivers. Nothing worked. I asked my coworkers for help; they offered no new ideas. After over two hours of troubleshooting, I was about to tell the customer to send the printer in to us for repair when she asked quietly, "Should I try printing on a piece of white paper instead of yellow paper?"我在惠普公司打印机部做技术支持工作已经有一个月了，有一天我接到一位客户的电话，她的问题我没办法解决。她的问题是：打印机不能打出来，但是颜色都正常。这让我觉得很纳闷，因为三原色就是蓝、红、黄。我建议客户更换墨盒、删了驱动程序然后重新安装，但是都没有效果。我咨询同事们，他们也不知道该怎么办。经过两个多小时的交涉，我打算让客户把打印机寄给我们，这时候她平静地说了一句：“我是不是应该把这张黄纸扔了换一张白纸再打印试试。”
