Dell optiplex 790 ultra slim
Not sure how many of you run Dells in schools these days, as they're not cheap. We have them in each classroom as the teacher pcs. In 4 out of 35 rooms, we have an issue with keyboards not being recognised by windows during the startup procedure. They dont respond to any input on the log on screen (Windows 7). If you unplug, and then plug in, then all is ok, as windows recognises them as a new hid. We have flashed the bios to the latest version in line with Dells support call request, and have done the obvious like swap out keyboards, and changed the USB ports we use, all to no avail. The other USB peripherals seem unaffected.
Any and all ideas welcomed