Upwards of hundreds of users have posted negative comments about their brand-new iMac computers on the Web. The majority appear to reference problems with the displays, while a sizeable minority point to problems with the processor; some are complaints about cracked screens. Most of the reports were about problems with 27-inch iMacs. Apple Web sites show there’s now a two-week delivery lead time for these PCs. This is apparently so Apple can replace the graphics card.