The DVR wasn't faulty. It did exactly what he asked it to do. Unfortunately, KGuard didn't think it was important enough to include the information about how to reset the video resolution in their manual or online.
I sent an email to US support email address and got a reply very quickly (I thanked them for the great customer service) and they provided me a PDF document that describes how to enter a blind sequence of buttons on the front of the DVR to reset the video resolution to 800x600. Once I did it, I was able to get the video display again and set it to something that my monitor could handle. The following is what was in the PDF:
SHA VGA resolution set too high
If you accidently set video resolution too high for your monitor, please note that there are no master reset/hardware reset that can change resolution. You can take following actions:
1. Please use BNC video output connect to display monitor and change your resolution
2. Please use a display monitor (CRT/LCD) that supports high resolution (for example:
1920*1200) and change your resolution
Note: If you set resolution to 1920x1200 and prefer to use blind button pressing, then please follow the steps:
SHA-104
1. Power off SHA-104 DVR
2. Power on SHA-104 DVR, when you see "System initializing..." message please wait 30 seconds then go to step 3
3. Please press the front panel button in exact order:
MENU button --> Right button --> Right button --> Down button -->
SEL button --> Right button --> Right button --> SEL button -->
Down button --> SEL button --> Down button --> SEL button -->
Down button --> SEL button --> Please wait 3~5 seconds -->
SEL button --> ESC button --> ESC button --> ESC button
SHA-108
1. Power off device.
2. Power on device, wait for 30 seconds after seeing the System Initializing screen message.
3. MENU --> Right, Right, Down, SEL (now in the System Setup menu)
4. Right, Right, SEL (now in Video Setup)
5. SEL (to access the VGA resolution drop down)
6. Down, SEL (to select the next resolution in the list. List is circular, so if already
at the highest resolution, the lowest will be selected, if at the lowest
resolution already, the next higher value is selected).
7. Down, Down, SEL (to apply settings)
8. Wait 3~5 seconds, SEL (to OK the attention popup).
9. Menu, Menu, Menu (to return to the main screen)