Acer Laptop E5-511 do not boot at all!

Hello,

My acer laptop, when turned on, got stuck when the acer logo shows up and then nothing happens. Later, I tried buttons like , f2, alt+f10. f2 gets me to the boot menu but when I tried booting, nothing happens. While the alt+f10 buttons delivered me a message which says, " Default boot device missing or boot failed. Insert recovery media and hit any key. Then select 'boot manager' to choose a new boot device or to boot recovery media". and then gave me an option "OK". When I press enter key, leads me to a boot manager menu with one optoion, i.e, WINDOWS BOOT MANAGER ( ST500LT012-1DG142). When I press enter key , again the, " Default boot device missing........." message shows up again. Can you find me a solution?? please



Thank you
M. James