I have a Acer Aspire 5 Slimline Laptop that I am trying to fix up. When I bought it, it was missing it's HDD, RAM & LCD screen & most of the LCD screen assembly. When I put a 1TB HDD & 16GB RAM in it & hook a external monitor up to the HDMI port, I can occasionally get it to display a "No Bootable Device" message, due to the HDD being unformatted, & I can also get it to sometimes show the post screen & UEFI\BIOS menu. However when I hook up a replacement LCD screen & assembly to it, I get no video signal on either the LCD screen or external monitor. Could this be a problem with the UEFI\BIOS?