First thing to look at always is the power LED. It should become lit after power-on and half a second later it should become brighter. If it does not get brighter, the processor card is dead or not connecet correctly. Compare it to your working Amigas.
If the LED becomes brighter, most of the hardware is working correctly. At least the processor, the Kickstart ROM and the CIA which controls the LED are ok.
The color on the screen does not say anything if the LED stays dimmed. Because if the processor does not set the LED bright, it does not even come to a point where it can change the screen color.
The same is true for the boot menu. If the kernel does not work, there is no way to enter the boot menu. The boot menu is the last thing to check. First the power LED, then the screen color, now perhaps the HDD led and at last the boot menu.
Bye,
Thomas
