LTD2516HD-C is stuck or frozen at start up
Few possible solution for this problem
open the lid for the DVR, disconnect all hard drives and reboot. If does not freeze change hard drive. Some old DVR’s do not support more than 2 TB.
The power cord or power adapter went bad.
Update firmware 24XXMD
download this file to a USB, not USB 3, renumber this is old DVR use USB2 if by the time you read this USB4 is available, just forget about this one and buy a new one