BSOD problem and hard drive not booting now

[raki.leaveme]

BSOD problem in Acer aspire E1-531..before BSOD problem it used to switch off once every 30 minutes with a good battery. No backup issues.recently got BSOD problem .I tried safe mode.in safe mode blue screen never appeared. But since I was not able to watch videos in safe mode,I chose system repair and it didn't help,disk image didn't return any previous disk images and system restore if selected doesn't show any previous system states.only option left is system repair and it shows it is doing repair and it might take hours to to repair it,but in the process laptop shuts down as usual in 30 minutes and i have to start it again.Now while trying f8 options and restarting ,I don't know what I did but the system while switching on says no bootable hard drive. Not able to turn on safe mode or able to choose system repair now.I switch on the system and it shows no bootable drive.how should I fix this? Will OS flashing delete my data?

 

[johnbl]

if you can not boot up windows you need to make a usb boot image from Microsoft. boot the repair image
and run these commands and see if you can boot.
bootrec.exe /fixmbr
bootrec.exe /scanos
bootrec.exe /RebuildBcd
bootrec.exe /fixboot

https/support.microsoft.com/en-us/help/927392/use-bootrec-exe-in-the-windows-re-to-troubleshoot-startup-issues

then try to reboot your machine. if it does not work then you would have to run the repair image and run the diskpart.exe command
and list the drive letter assignments for your drives.
and confirm that your windows partition is still assigned the c: drive. but try the bootrec commands first

-------------
if you can boot:
go into windows control panel and set the system to run in high performance mode so it will not try to sleep. Just to see if it still shuts down after 30 minutes.