If it's a USB keyboard, go into bios and make sure that USB is turned on at boot, not partial or selective. If that doesn't work, at password, unplug the keyboard, then plug it back in. The pc should recognize a USB is added and power on the kb. Once you type in the password, go to the user/people settings in control panel for your account and make the new password blank, verify blank. If fixing the bios does fix the problem with the kb, then removing the password is a personal option.