if you press Alt+F10 keys at boot, are you able to enter Acer recovery?
please check also on BIOS (press F2 key at boot to enter it) if your HDD is listed as bootable device under Boot tab.
have you updated the BIOS or did any change to it?
if you have a windows 7 bootable media (DVD or USB flash drive) try to boot from it and check if you are able to repair your installation.
you can use any USB flash drive bigger than 8GB but you will need to find a valid windows 7 iso to create the installation media.
I would just like to add to the excellent advice given by Ironfly.
The message of no bootable device can be a change in the BIOS. Even though you have not changed anything, it would be good to go and just run thru the settings and tell us about anything that shows a boot order / sequence.
It may be possible that your HDD has actually failed, and you want to recover data from it.
So if there is a sticker or anything that gives a Windows 7 key or serial number write it down.
If you have such a thing you then try and get a Microsoft downloadable iso and make a USB stick with that.
Other possibilities exist, but please explain your current capabilities and what you feel able to do with help from here.
This tutorial works on all brand laptop /desktop working at windows platform. Follow these steps to fix your issue.
If you are getting the error "No Bootable device found"after updating Acer bios from 1.00 to 1.05 then follow these steps :
If you have installed windows8.1 or windows 10 or windows7 and after BIOS update you are getting an error like “insert boot disk” or “no boot device found press any key” or you have a problem with boot mode like UEFI to legacy this article l can fix you no bootable device problem in Acer aspire e15 or any other brands of laptop.
no bootable device Acer aspire e15 start
If you are getting the error “No Bootable device found”after updating Acer bios from 1.00 to 1.05 then follow these steps :
Full article here : How to fix no bootable device acer aspire e15 at start ?
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