I perused the forums but didn't see a similar problem so I'm sorry if this is rehashing something that has already been solved. My problem is this: When I start/restart my mac os x 10.5.5 (2.4 GHz Intel Core 2 Duo, 2 GB 667 MHz DDR2 SDRAM) the desktop refreshes several times before going back to the pale blue screen and then refreshing a final time. The mouse is then sluggish and/or jumps sporadically. What I've tried: AppleCare, Apple Hardware, Onyx Any ideas? Thanks!