Shut you’re your pc and then restart it after plugging the cables in it.
No bootable device issue can also be caused if your Acer computer has loose cables, and you need to make sure that they are plugged tight back in their ports for each peripheral device. This is most likely to solve your problem of “no bootable device.” The best solution for such a problem is to disconnect all the linked USB devices to your system, including your keyboard or mouse if they have a USB connection. There is a possibility in most cases that any USB device connected to the Acer computer might be stopping the computer from booting up.
