on start up-- black screen -
'no operating system' notice
fiddled around -f12 and f2-ctrl/alt /delete
got it started-somehow-everything is there
been working fine
whats happened?

WORRIED, July 2016

sorted -think i had a usb f/drive plugged in
silly me

happier, July 2016

Do a Google search for "Windows 7 no operating system" (Come on - you DID try that, didn't you?)

You should see a lot of results.

including: http://www.pcadvisor.co.uk/how-to/windows/fix-error-message-operating-system-not-found-3360697/

XXX, July 2016

I have had this once or twice on my Dell laptop - Intel W8.1

I had no idea of the cause and it came and then went away - no issue for more than a year now. Your situation together with my experience strongly suggests to me an issue of software rather than hardware.

My fingers are crossed in the hope that it was a passing phase - perhaps you should cross your fingers too.

http://tinyurl.com/zkj6dv8

Good Luck..., July 2016