Do you remember old SCSI cards that had an autoboot jumper? Setting it to be disabled meant that you had to load drivers manually, in software. The ROM jumper on the Deneb works the same way. Fire up Trident, configure Poseidon, bring the stack online, and hit Save.
Now go into Luciferin. There's a menu option called quick setup that loads in the correct Poseidon modules. Try that.
I noticed earlier that you had both denebpiousb.device and denebz2.device in your modules list - that might be your problem. denebpiousb.device is only for A3000s or A4000s. Since you've got an A2000, make sure that only denebz2usb.device is configured in Poseidon/Trident and getting uploaded to the Flash.
Also, on the Bootloader tab in Luciferin, set the 3 options the following way: Re-install on every boot, left mouse button, status as colour. Now if something bad happens, just reboot while holding the left mouse button and the Flash will be disabled - just as if you'd used the ROM jumper. Extremely convenient feature!