Safe mode no password Win 10 problem

The downside of using Safe Mode [a diagnostic] is that many drivers for devices don't get loaded so they become unavailable like the fingerprint reader. Same for a PIN number which is based upon/attached to the password used when it was created. Using other bootable media can also be a problem.

You need to read your computer manual to find out which key to press at the start of bootup in order to tell it to use the USB.

The key required varies between computer makers.

If your computer maker has a support site or a user forum then you could also search there for guidance on booting from a USB.
How to boot from USB disk - LenovoSupport says you use the F12 key

Then you should be able to get out of Safe mode
How to - Escape from an MSConfig-induced Safe mode boot loop - TenForums
Boot into Safe Mode - TenForumsTutorials

Denis

Some motherboards don't allow booting from a USB drive if secure boot is enabled in the bios.

Fabler2 said:

Some motherboards don't allow booting from a USB drive if secure boot is enabled in the bios.

Doing this would be a bad security policy, since the Secure Boot protection would be disabled when booting from a UFD.

In my experience, with Secure Boot enabled, some (few) boot UFDs don´t boot, but this is because of the ISO or the procedure used to build them. Sometimes a message appears, sometimes there is no message, the UFD just does not boot.

Edit - this applies to boot in UEFI native mode (UEFI only).

About the 'secure boot' discussions

In any case, it should all be alright because the OP now has a link to the Lenovo guidance on booting from a USB [and the article contains a check of which models it refers to].

Denis

Anibor said:

Doing this would be a bad security policy, since the Secure Boot protection would be disabled when booting from a UFD.

In my experience, with Secure Boot enabled, some (few) boot UFDs don´t boot, but this is because of the ISO or the procedure used to build them. Sometimes a message appears, sometimes there is no message, the UFD just does not boot.

Obviously disabling secure boot is less secure but sometimes disabling it or going to legacy mode is the only option and re-enabling after the work is done . Otherwise you're stuffed.

When discussing security there may be 2 choices, Safe Mode or Safe Mode with Networking. The second choice will enable the network adapter so the first choice should be safer for most purposes in diagnosing.