Well i have 2 ideas it might be the usb cord i use to connect my psp to my computer or a solution is the dreaded system restore which i wouldn't mind doing but it'll probably be my last resort.
So I've had my psp for a year and it's been working fine whenever I plug it in but now whenever i do it says, "usb device not reconized" or something like that and in device manager it says unknown device.