Using the arrow keys, move to the “Boot” tab, and change the boot request settings to make Hard Drive the first boot priority.When the primary logo screen shows up, quickly hit the F2 key to enter the BIOS or settings of the boot tab. Hold the main power button for 5 seconds to control the gadget.In case that you have connected any unbootable disc in your Acer PC and you set the priority asset to boot device, then there is also a possibility of this error saying “no bootable device.” So to make sure that your PC is safe and fine, you have to set the boot order and change it from all the system framework to the bootable device. 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.