Okay so when I launch my laptop it's an acer aspire, it launches gets the the acer screen and then comes up with no bootable device. When I press f2 it comes up saying "default boot device missing or boot failed-insert recover media and hit any key- then select'boot manager' to choose a new boot device or to boot recovery media . I then proceed to press enter and it takes me to the boot manager and there is nothing there. Please help