The new PCs start at $299 and include a preinstalled copy of LindowsOS, a version of the open-source operating system that sports a graphical user interface and the ability to run Windows applications, according to its manufacturer. but... Adding a 17-inch monitor, priced at $128, to the 1.3GHz Celeron SYSMAR703 desktop makes for a computer package that costs $527. To beat that price, one would have to purchase Emachines' entry-level T1140 desktop. It includes a 1.1GHz Celeron, 20GB hard drive, 17-inch monitor, CD-ROM and a copy of Windows XP for $519 after rebates.