One third of all all-in-on PC sales were claimed by Apple for the iMac range. The numbers are from the third quarter of 2011. In second place was Lenovo with 22.7 percent of the share. 

The reason Lenovo did well was due to strong sales in China where its all-in-one PC range has taken off. HP took third place with 21.4 percent of the sales.

Research indicates that in 2014 there will be over 23 million sales of all-in-one PCs which are typically large screen devices with +20 inch sized screens.

SOURCE:http://www.gadgetvenue.com/imac-range-claims-a-third-of-all-in-one-pc-sales-for-q3-2011-01052839/