Amiga 3000 Flashing Yellow Screen

[Azryl]

Check the crystal... my A3000 once did this.

The crystal had worked itself loose and was not making correct contact in its socket. Push on the crystal see if that works

Az

[Azryl]

I beleive the A3000 keyboard will give a reset pulse even if parts of the motherboard are not functioning correctly.

Have you rechecked the jumper settings? The PSU jumper for internal CLK manufacter signal etc?

Last resort, call a priest, have an exorcism bcuz that motherboard is possessed

Az