Hi, please help, While sat using the laptop the other night i suddenly had a yellow box appear in the bottom right corner telling me that the USB device could not be recognised. At the time there was no device plugged into any of the ports. I tried to troubleshoot to see what was going on but nothing got resolved so i rebooted. Still happened after restart still with nothing plugged in. I have tried everything i know to resolve this problem. Checked device manager, all 3 usb devices are saying that they are working correctly and there are no red or yellow marks next to them. I have uninstalled them and rebooted, same problem. Now none of the 3 ports will work at all. Tried various devices in each of them and nothing except for residule power that will turn power lights on if the device has one. Not sure if this is linked but tried to enter bios just to check settings but what i know to be my password no longer works. I HAVE NOT changed it and nobody else has access to have altered it either. I have tried backdoor passwords and they wont let me in either. Please help, this is driving me nuts.