Why can't I log into my computer?

[Windows Central Question]

I updated to windows 10 for free but ever since I have not been able to get to my home page. I turn on my computer and the windows symbol shows up in blue with a loading circle below it then the screen turns black but it's not off.
Please help

 

[ven07]

does pressing ctrl+alt+delete do anything for you?

 

[Suq Madiq Lel]

Maybe you need a clean install?

 

[AndyCalling]

Black screen at boot is W10's lovely alternative to a blue screen crash (now with even less info!). It generally means a hardware error, but that is probably caused by old W8 drivers/software. Such can be even more likely to cause a fault if you are using a TPM secure boot (Asus AISuite II does this, for example).

Good luck, a clean install is the best bet, but don't expect Windows 10 to tell you what's going on. Error messages have gone the way of updates - no info provided, you have to guess.