trouble with keyboard and mouse

i have been posting the smallest of my problems i have been facing and
getting help. thanks for the help but now i have encountered another
problem. the usb port is powering up my ps2 mouse but its not working.
i have read quit a few posts that say to get a hub with external
power. and that should solve the usb issue. but i wanna use serial
keyboard and mouse with usb to serial converter. please help. and
thanks in advance.