I installed a new system for the original buyer of a LT8240MHD DVR 8 port system.
He gave his old LT8240MHD system to one of his employees and I installed 6 cameras also from his bosses house.
Next day his kid was messing with the mouse and all went black.
I figure maybe he changed display settings so tried VGA and the BNC video output and neither HFDMI VGA or video out sends signal to the tv.
At least yours showing above has the black camera boxes, this sends nothing at all to the screen. I tried another power pack, took out the battery rebooted, unplugged and put battery back in rebooted still nothing.
Even the mouse don’t light up.
Any suggestions? Feel bad I installed this and 1 day later it is sending no signal.
My next step is to try network and see if it detects and try to access. meanwhile I am against a brick wall what seems to be not booting up or something
Ron