A friends Vostro 220 running Windows 10 had a motherboard go out. I had a Vostro 200 with a similar board. I expected to have problems with the OS starting. If it couldn't boot or repair itself, I was prepared to reinstall Windows. When started, the computer boots, then goes to the Windows logo and hangs there. The spinning dots don't appear and it does nothing more. I figured I'd boot from a Windows 10 install disk and attempt repair from there, but it hangs on the logo also. I tried a couple other Win 10 disk and USB install with the same result. Out of curiosity I tried a Windows 7 DVD. It booted. So did Windows 8 and a couple other various boot disk I have, but nothing with Windows 10 will boot.