"Startup Repair could not detect a problem". It says if I have attached any new portable devices to the computer, remove them and restart computer. And if I continue to see this message, contact system admin or computer manufacturer. There are then 2 options- 1. view diagnostic and repair details, 2. view advanced options for system recovery and support. Then at the bottom there is a "finish" & "cancel" box. The diagnostic/repair report said: Tests performed- Check for updates(ok), system disk test(ok), disk failure diagnosis(ok), disk metadata test(ok), target OS test(ok), volume content check(ok), boot manager diagnosis(ok), system boot log diagnosis(ok), event log diagnosis(ok), internal state check(ok), boot status test(ok), Boot status- OS booted successfully. Don't know if it is important, but the whole startup repair took only about 10 seconds. But several of the tests have varied amounts of time taken= 47ms, 16ms, 109ms, etc. The advanced option then goes to System recovery options again.