I reviewed your original thread where you replaced the formatter and the print mech board. There was mention of the possibility that you had a power surge from lightning back then? It could be true that lightning does strike twice?
Before pulling any components, first remove all your cartridges and restart the machine from the power switch on the back of the printer. See if the printer will come up and ask you for the carts. If it does, you might be good to go.
If not,
You could try taking out the current formatter board and replacing it with the old one. Try this next. See if anything happens.
Whatever any of us do, one thing to remember, is to replace components one at a time, and never two or more at the same time.
Print heads and Cartridges excepted.
The logic system is logical. It deals with issues one at a time. If at first you don't succeed, keep trying at least three times before moving on.
Mark