I hope your thread is not dead... I experience the same problem as attigabi. My Logitech mx1000 is not detected as a PS/2 mouse when the computer is turned of. However, if i start up the computer with another mouse connected to the PS/2 port and switch when the system is up, it works fine. It also works if i connect it as a USB mouse, switch and restarts without turning the computer off. I have tested everything I can think of. All drivers are updated, most of my PCI card has been removed to avoid conflicts, I have tested four different MoBo bios versions back in time. So far no luck. The reason I whant the mouse as a PS/2 mouse instead of the USB option is that I have a 30 feet PS/2 wire for control when whatching film on TV. Did you have SATA HDD? Raid? Could that be a problem?
3com WiFi lan card