The turmoil at Apple Computer Inc continued yesterday when the company cut prices on many of its desktop, portable and server computers, and launched a special rebate programme in the US for its Performa line. Effective immediately, prices on the Macintosh Quadra 950 systems are cut by up to 29% so that an 8Mb model is now $4,000, Apple Workgroup Server 95 by up to 20% and Powerbook notebooks by 7% to 34% – a 145B 4/40 is now $1,430 and a 180c 4/160 is now $4,080; and until September 20 it is offering rebates of $100 to $200 on some models of the Performa line.