hi all, this problem started out as just one port, but quickly has spread to all ports. i installed a new printer hewlett packard 3550 deskjet, which initially worked perfectly and then died after printing once. i have also just installed a dvd burner (LG super multi RW) which doesn't seem to work properly either. since installing these new things all my usb ports have died. further i have to restart my computer often three times before the mouse will work. worried. any suggestions?