We have a Dell R220 running Windows Server 2012 R2 Standard that has begun freezing during the boot process after doing a routine reboot. Specifically, once the Windows logo with the black background appears it freezes and won't move past that screen.
We've tried entering repair mode, safe mode, and even inserting an installation DVD and booting from that. In all modes of booting the system gets stuck at the same spot. The failure to boot from external media has me really perplexed and leads me to believe this might be a hardware issue.
What would be the next best step to narrow down the issue?