Try reinstalling the graphics drivers , I always found that getting the graphic cards drivers from its manufacturer is better and Upto date and other versions are available
Only if its a graphic problem
You could get your self some ir beams if its just an area you want to cover as in someone walking past or across your drive , beams could still trigger a chime or other things depending on how far and techincal you can go
Example
https://www.securitywarehouse.co.uk/catalog/risco-ir-beam-72-up-to-50m-p-3308.html
Geezer it won't last
Option1 strip out the bellbox and buy a flashing led kit with battery pack
Option2 drill hole through wall use power adapter to power leds in stripped out bellbox
What your doing as said above won't last
No battery shouldnt make difference, although faulty batteries can damage the panel
You do realise test is just an approx 5sec burst and it will change when you take that off?
What connection have you made? Example strobe to -strobe etc
Also take the bellbox down and wire it up next to the panel , it may help in you working out what you have done wrong , still possible its faulty of course
Is your multimeter turn dial and you switched it round amps dc to measure current? How did you have leads connected when doing this
You check any fuses?
Customers all think wireless all the rage, it has its place , but look how many bigger companies follow suit , small install charge , fit junk Aslong as the movement get there monhly charge
On a side note in China some group called Falun Gong spiritual movement has been banned since 1999 declared as an evil cult, couldn't work out why strange group
If you have other income , don't bother with lower end kit , no point, otherwise that's all you will get ie type of customer , you want those who want premium goods
Long shot maybe a key is stuck , maybe open it up seems you done everything else and clean it up, is it led version?
House basher's will soon be here with better advice I am sure!
Perhaps wiring incorrect double check what you fixed
Shouldnt be , means you maybe doing wrong code, how did you get sound back from keypad? Battery needs replacing regardless , did you try power cycling?