Q-see NVR Not Booting up

I recently purchased a used Q-See 818 8 channel NVR with PoE. It seemed to work fine but now fails to boot up. Powers on, fan runs but no initialization/boot-up. I pulled the 1TB SATA hard drive and tried it in a slide-in tray on my PC and it does not work. I don't have a spare 1TB drive so I tried a 500GB drive in the NVR but it still does not boot up. So my question is does the NVR require a minimum 1TB drive installed in order to boot up? Very much appreciate an answer to this.

I recently purchased a used Q-See 818 8 channel NVR with PoE. It seemed to work fine but now fails to boot up. Powers on, fan runs but no initialization/boot-up. I pulled the 1TB SATA hard drive and tried it in a slide-in tray on my PC and it does not work. I don't have a spare 1TB drive so I tried a 500GB drive in the NVR but it still does not boot up. So my question is does the NVR require a minimum 1TB drive installed in order to boot up? Very much appreciate an answer to this.

It should boot without any hard drive, imo.