2007 iMac 24" black screen works for 2 months then black for 2 months?

So my 2007 iMac 24” has the black screen issue, but not the typical issue where you can see the display if you put a flashlight to it.

It goes black then I try the pram reset, then try to boot another 10 times then put it in the garage to collect dust for a couple of months. It does make the normal spin noise from the cd/dvd on boot and it does chime. After a couple of months if I plug it back in and boot it, it works.

Then a month or so goes by and when I boot it, it is black screen again. It should be noted the #4 LED is off when it goes through its couple of months of being black.

And on when it works. I’m not sure if moving it around after a couple of months has made a bad connection reconnect or if maybe the temperature in the garage either makes some faulty connectors expand or retract and then it works again.

Any ideas? I’m thinking its a loose connector or a faulty connector somewhere, but this process always repeats, its reliable for a month or so, then black for a couple months, then works again.

Rinse and repeat …

I know some people will say its a bad LCD, or bad inverter, or bad I/O board, or a bad logic board, but if I show it to someone while its going through its phase of working and ask whats wrong with it?

The answer would be nothing, it looks like everything is working fine.