Why won't the logic board boot?

The logic board was bought off eBay actually. It was after I received and replaced it, I found out about the note. I wonder why this is. Should have read more information on beforehand, although I thought had a lot covered.

I am used to work with pc stuff and can handle technical information. Could you perhaps tell me what the differences are in the hardware configuration between the e-star and non-e-star model mid 2007?

The only one I found was: battery connector / sleep. Other components like the dc-in board, smc, should be generic for Apple's productions sake.

And thanks for taking the time to answer my question.

After some more research I found this answer on iFixIT: Are MacBook parts interchangable?... which also answers my question:

"Models with "Energy Star" printed on the board in the RAM slot have 2 fewer pins on the battery connector, and the logic board has 2 fewer holes."

And a wonderful suggestion back in march by lemerise, calling for a sort of 'exchangeable part list'. I say: "hear, hear!" and would like to vote +1 to this suggestion. Such a grid would have answered my question right away. (Grids don't answer questions, I know)

So looking back at my original problem: logic board won't boot; it can be:

• broken keyboard

• wrong battery connector (checked, should boot w/o connector)

• broken DC-IN (checked, pwr led turn green and amber when lid closed)

• broken logic board

• broken RAM (checked, worked fine)

• No HDD installed (not checked, should boot anyway)

• PRAM / SMC (checked, both reset)

So I'll go with the keyboard and otherwise the logic board is toast.