g3 b&w minitower not working

[Lololobolosse]

Hello, i have a beige g3 minitower that have a really strange problem, when you turn it on it chimes but it's not booting, it's not even trying to read off the hard drive or the floppy drive and no display.
But i can get an image like in the pictures when i unplug it and plug it back, there is an image but only from an pci mac edition gpu.
It does not seems to work with the dip switch adapter.
And you need to repart the process to have a 2nd time the image, if you only reboot it, there will be no display.
No macintosh logo on the screen.
It's like there is a problem with the rom.

 

[paardenkapper]

Have you tried the obvious like resetting PRAM/NVRAM?
Is the PRAM battery present and has sufficient voltage?

Do you have a secondary GPU to rule out a GPU failure?

 

[Lololobolosse]

Have you tried the obvious like resetting PRAM/NVRAM?
Is the PRAM battery present and has sufficient voltage?

Do you have a secondary GPU to rule out a GPU failure

Not any keyboards works because of the mac not loading the rom, there is a brand new pram battery, and like i said in my post im using a gpu on the pci slot since i cant get anything from the integrated graphics.