Some customers have reported that after installing Mac OS 8.5 onto a PowerBook G3 Series computer, their ixMicro ix3D Road Rocket video card no longer allows external monitors to sleep. This update addresses that issue. Note: Macintosh PowerBook G3 Series computers should not be confused with Macintosh PowerBook G3 computers. Though the names are similar, there are significant differences. To visually identify which type of computer you have, close the display and inspect the display case. A Macintosh PowerBook G3 has a small, six-color Apple logo on the display case. A Macintosh PowerBook G3 Series computer has a large Apple logo on the display case that is not six-colored.