Hello, I have a Dell Optiplex Desktop which has only USB ports for keyboard & mouse connections. the USB stoped working and the system freezes on Booting while loading BIOS if any USB device is connected to it but boots to desktop if no USB device is connected. sometimes it asks for BIOS configuration. The problem is without any input device how can one configur BIOS? I had an engineer check up the boards (Front and rear) and certified them all good. I tried getting a PCI USB Adaptor but it didn't work out. As far as I know, there is no PCI PS/2 adaptor in the market here. What do I do next? somebody help out pls.