My laptop has recently got a very weird problem when sometimes when i wanted to boot it, it says "No bootable device found".
The weird part about it is that when i reboot, my laptop boots fine! If my hard disk had failed, it wouldn't boot at all!
I've got the same problem with my Acer laptop (the same type).
What was your solution for this problem?
My laptop seems to have fixed itself as I haven't had the issue in a long time.
As for a potential fix, maybe try opening the laptop and ensuring the SATA cable connecting the hard drive to the main board is seated properly and isn't damaged.
I hope this helps.