Has anyone run into problems with a MXM453 that has problems reading the thumb drive. This started out as an intermittent problem that would start working again with a machine reset. Know it doesn't see any thumb drive put in front or back usb port. I changed the little usb pwb on the ops panel, no change. I unplugged the the keyboard, no change. I flipped the bottom dip switch and tried the back usb port no luck. I replaced the ops panel as a whole unit. Is there something I'm missing or do I need to start replacing boards.
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