White screen, no chime, keyboard not connected

I saw similar questions but could not find the answer. I will try to give all details.

I had upgraded my iMac Late 2012 to SSD - Toshiba TR200.

With a Windows installation usb I had to format the drive first then with macOS boot usb I had installed High Sierra by choosing APFS file format.

I worked fine, opened normally, restarted normally, I had browsed internet etc no problems.

Then I had to reinstall High Sierra with a bootable usb for some reason ( i wish i had not).

On boot screen, instead of usb drive, I mistakenly selected third item, i do not remember its name. First was my harddrive, second was usb drive that should have been selected.

Now it stucks at white screen. No chime on startup. I hear fans. I wanted to try some startup key options but I think my bluetooth keyboard is not connected, because caps lock light does not work. I do not have a Apple wired keyboard but have a wired PC keyboard.

As a last try I have reopened and put my old HDD but it is same.

I would be glad if you could share any suggestions.

Thank you very much.