@desantii
Under Kickstart 2.04 and up, most of the error colour codes were scrapped and not implemented on the Amiga A1200 it uses Kickstart 3.0 and up, as such MOST codes mentioned are not a good enough indicator of what the error is.
To be honest, "RED = Hardware Assetion Failure" is the only garantee you have.
I have to admit I love this bit =)
Or as taken from the Amiga 4000 Service Manual:
Failed Test
Red ROM Error - Reseat or replace
Green CHIP RAM error (reset AGNUS and re-test)
Blue Custom Chip(s) Error
Yellow 68000 detected error before software trapped it (GURU)
Now, I have an A4000, and I will be damned if I can find that Agnus or that 68000 cpu.
The above only really applies to A500's and A2000's with Kickstarts under 2.04 otherwise most of the error colour codes you will get are a guestimate at best.
Now it would seem that you are suffering from FPU assertion failure, that is to say, you put it in and the system hangs, the question is - why?
the FPU is quite a transparent circuit to be honest, I am assuming you have the following card
Two FPU's and 4 Oscilators lends me to believe -
1. theres a fundamental fault with the card,
2. you have either the xtal or FPU inserted incorrectly
Lets take the easy one (number 2) and isolate that first
Next is a little more involved, so lets see what we got -
With the FPU installed and no Xtal in the socket the system wont boot:
As the FPU is not reporting, hence the black screen of nothing-ness: this is to be expected - even though there are two chips with different pathways (the FPU and the mobo based CPU) both of these are seen as one entitiy by the system - as such if the FPU doesn't work niether will the onbard CPU.
With any XTal installed the FPU an error screen is shown:
Now this can be a number of issues however we can rule out the following
1. it is not an FPU failure
2. it is not and XTal failure
so what can it be ?
Lets take a look at the mechanical,
1. Inspect the solder points of the Trapdoor connector, do any of them touch each other?
2. Inspect the FPU socket is it cracked or fractured in a corner?
3. Inspect the FPU socket Pins, are any of them crushed/crippled inward
4. Inspect the XTal socket - do all the XTal pins fit nice and snugly?
Thats just to begin with, hit that lot up and see how you get on =)
good luck