mac os sierra issues

while booting mac os sierra it stuck at (succeful wake unit 100 sleep unit 0..)three to four these lines reapeat. as in above picture.
help me is my installer usb is corrupted or it is kernal panic

I was trying to update from Mountain Lion to Sierra. When I was trying to download Sierra from the App Store to create the boot USB, it wouldn't let me. So, I used these instructions to change the System Definitions to iMac14,2:

https://www.tonymacx86.com/threads/...acpro3-1-macpro4-1-system-definitions.200868/

Now, my computer only boots in this Boot Manager screen :'(... I thought I could boot from a USB if it had Multibeast, Unibeast, and the Sierra Install on it... Not working. I think it may be because I changed the System Definitions before I was able to run the new Unibeast (I didn't think changing the System Definition would lock me out of the computer!)

Any help would be greatly appreciated, so I can get back to work! Thank you!

high sierra gimme this error