SuSE (SLE15 SP4) HPC freezes/locks up during boot up after the grub menu

I manage an Ada Supercomputer made by Symmetric Computing at my work. Here is their website: . It runs SUSE Enterprise 15 SP4 (HPC). It will start the boot process just fine. It will go to the grub menu and automatically select the boot operating system, SLE15_SP4, and during the boot up, if you hit the ESC key, it shows the text mode boot up process and there are not any errors at all, however, when it gets to [OK] Started User Login Management, it will freeze every time and will not do anything. You cannot hit ESC and go back to the loading screen withe Logo, access tty or anything. During the text boot up, the terminal cursor blinks, once it freezes on Login User Management, after a few seconds, the cursor even disappears. Any help would be appreciated. Thank you.