Imac Stuck never boot to show disk Utility

[mike000000]

Hi to all,i have an Imac and can't get to Disk utility,no matter i tried recovery, and install os from an original usb,not even single user booting, i will attach a picture to show where it's stuck,i tried different hard drive , it seems a hardware problem,i was surfing the net , then it started to reboot by itself,many times then stuck,any help will be appreciated.
Thank you in advance
Mike

 

[maflynn]

The picture shows what could be a partially disassembled iMac, did you take this apart and then incurred some issues?

 

[mike000000]

T

The picture shows what could be a partially disassembled iMac, did you take this apart and then incurred some issues?

Thank you for you reply, i had the problem first, then i disassemble the imac and cleaned it, then i tried to boot as a single user i got to the root,Is there's any way i can get to disk utility from the root? and when i tried to write command su-(password) ,is the password same as i used to use for installing application or there is a default password to access from root? because i used my password and is not recognized! any help will be appreciated.
PS. I was surfing the net then suddenly it's rebooted by itselfmany times(loop),then stuck at what in the picture!
Thank you in advance
Mike