unable to start my computer.Getting an error like bootmgr is missing..

[bidisha12]

I am unable to start my computer.It is showing like bootmgr is missing..Even it Is not able to detect the bootable device so that I can boot it from a disc.plz help.

[Huffer · Accepted solution]

Go into the diagnostic mode by tapping F2 as you power up or esc and select diagnostics...run the full hard drive scan and report the results back here. 

[bidisha12]

Hi..thnx for ur suggestion..The report is showing like-SMART CHECK:passed
Short DST:passed...what's next?

[bidisha12]

Hi..thnx for ur suggestion..The report is showing like-SMART CHECK-passed
Short DST-passed. ignr the previous one.
what's next?.

[Huffer]

Then you have corruption in Windows. We can try to repair the boot sector. You will have to download and make a Windows 10 installation disk or you can try to get into advanced options and do a startup repair without a disk

http://www.tenforums.com/tutorials/2294-advanced-startup-options-boot-windows-10-a.html

Read that webpage and let us know if you can get into the advanced Windows 10 startup options...blue screen

[bidisha12]

nopes.only the bootmgr is missing screen is coming.I am not able to take the backup also.Moreover it is not able to detect any media
.

[Huffer]

Not sure what you mean can't take the backup or not able to detect media. What are you trying to do?

[bidisha12]

i want to start the screen.but it only shows the black screen..it is not detecting any cd or pendrive from which i can boot

[Huffer]

But you are getting the text message about the bootmgr...so it is POSTing. That is a good sign.