A customer brought me his Dell Inspiron 5748 touchscreen laptop. It would not boot and gave the same old "select proper boot device or insert boot media...". He thought there was not hard drive even though he'd been using it for 5 months. He thought his brother had taken it out to mess with him. The hard drive shows up in the BIOS as does the DVD Burner, but the laptop will not boot from either of them. I also tried booting from a thumb drive but it wouldn't work either. I keep getting the message you get when Windows can't find a boot device. At this point I'm thinking there's a motherboard issue. Am I correct? Am I missing something? Any help will be greatly appreciated.