Setting the BunkerHill Security monitor 60565 to Pal causes flashing.

I purchased a Bunker Hill Security system (60565) and noticed that one day my video suddenly started to flash. I tried to fix it by playing around with the settings, including changing the AV input to PAL (I am in the US which uses NTSC). I called Bunker Hill technical support and the support person told me that once you set the AV input to PAL you have effectively corrupted the monitor and it will forever flash even after you set it back to NTSC. That is insane. Is that really possible? Is my only recourse to by a new security system?
Asked Jun 27, 2017

TIP: If it's not your answer to this question, please click "Leave a Comment" button under the question to communicate with the question owner.