Message "Recovery - This computer needs to be repaired

Almost every time I try to boot my computer I get this blue screen with the message "Recovery - Your computer needs to be repaired - A required device is not connected or can't be accessed" At this time I am given several options F8-doesn't work, F9-does not work. F2 diagnostic tools which are no use except Bios modification. No real help.
Some times it boots up to the password entry screen. I used to log in with the pin code but that is not available now and my password is not accepted, even thou I know it is correct. There is no way I can boot up windows 10. What can I do? I have a recovery boot flash drive but the computer looks first for a cd/dvd drive then the C drive and I can't get it to boot the recovery disk.
rik brown

axe0, I can't get to the boot options or bios options. I only can get to system diagnosis and I have tried all of the options. The only one that helps sometimes is the Bios option where I rollback the bios. Sometimes this allows me to boot to the password entry but it won't accept my password. This password always worked before.
This trouble started after I tried to boot up into the safe mode.

axeo, All of the diagnosis came back normal, no problems found. I am at wits end. I have a windows 8 restore disk that will reload my computer to factory conditions but all added programs will be lost. Then I will have to upgrade to windows 10 and start all over in reloading all new programs, most of which have no disks. I have a backup image on a usb drive and I hope I can restore from it but with my luck, that will be corrupted also. Thanks for your help but i think its hopeless.

I gave up and booted with the windows 8 recovery disk. Then I upgraded to windows 10. Ran check disk - no errors. Fixed it so no password is required to enter windows 10. Loaded Aomei Backupper which is the program I used to back it up. Then I tried to restore the image file I had made before all this trouble started. The restore starts OK then I get "diagnosing drive" then "trying to repair" and that goes on forever. stopped the computer with the start button held down. When I rebooted it goes back the diagnosis and repair loop. At this point I give up and went back to my old laptop and will use it til it quits again. Thanks for the help axe0.