Sorry for the long post, however...\n\nAfter doing a weekly backup of data to my external USB Hard disk. I \n'stopped' the device, then unplugged it from my computer (it was using \none of the front USB ports)A few seconds after doing that, the computer \nsuddenly locked up and I had to resort to a hard reboot.\n\nAfter pressing the reset button, the computer just hung permanently on \nthe ASUS POST splash screen and wouldn't go further, so I just pressed \non the power button for 4 seconds to turn it off and waited a while then \nturned it back on again, but it still did the same thing, hung at the \nPOST splash screen.\n\nHaving another go at rebooting, I hit DEL Key to enter the BIOS setup, \nloaded the defaults and exited, now it wouldn't hang at the POST screen \nanymore and would boot into windows OK. However I found that none of my \nUSB devices were working anymore nor even being recognized.\n\nAfter rebooting back into Windows and still discovering that none of the \nUSB devices were being recognized nor working, I went into the device \nmanager to see if any of the system USB drivers were stuffed. As far as \nI could see there were no Yellow exclamation marks and checking the \nproperties of all of the USB entries stated that USB was enabled and \nwere 'working properly'.\n\nI uninstalled each of them, rebooted and windows re-installed them (then \nasked and used the Motherboard CD to install the rest). Rebooted and \nstill the devices weren't being recognized. The devices were still \nworking Okay on the Other computers, so that rules out the problems with \nthe peripherals themselves.\n\nBooted into Mandrake, and the same thing. Can't print (thinks it's \noffline). So I'm guessing the USB sub system of my motherboard is \npossibly fried. Also tried flashing it with the latest BIOS and \nresetting it to the default settings, still no go.\n\nIs there anything else I should do or check for, to verify that it is in \nfact a hardware fault with the Motherboard and not a software/driver \nfault, before taking my system back to the manufacturer? (currently \nstill under warranty)\n\nP4P800 Motherbaord\nP4 3.0GHz HT\n\nThanks for any assistance.