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Operating system not found
I have Sony Vaio I7, 8Gb memory. I do not have OS backup disk. I upgraded from 8 to 8.1 and then to 10. It has been running great. No problems. Use Kaspersky Internet Security. I shut down computer normally this morning. I powered back on this evening and there was a frown face saying something happened to computer and it would restart and had a percent complete number. I waited and waited and it never went above 0%. I performed a cold boot and shut down and then turned back on. The Vaio logo showed briefly and then blue screen saying no operating system found. Any ideas are appreciated.