bert
[Entry]
"Well, it sounds like the power subsystem is working, so that's a good start. Do you know for sure the screen is good? First I'd try resetting the PMU/SMC by holding down the power button for 10 seconds while the power is off and the machine is connected to AC power. Hopefully you'll see the sleep light flicker and hear a tone...sometimes resetting the PMU can kick a machine out of the mode you are experiencing. If that doesn't do it, try resetting the PRAM.
Next, I'd reseat the RAM, and try one slot at a time with the other empty, in order to test for a bad slot. Reset the PMU and PRAM every time you change the RAM configuration, just to be sure.
Make sure to keep the topcase off while you do all this...there's no reason to have the machine 100% together while it's still having problems and you may have to go back in. I'd also keep the battery out to avoid complications.
If none of this helps, I'd revisit the iFixit guide and make sure all connections are fully seated. Make sure you don't have a faint image on the screen, indicating you may have a bad screen or an inverter cable issue. You can try connecting to an external display, and if that works, you know there's something wrong with the internal display components, and if it doesn't work, you know it's something other than that. You can try disconnecting the optical drive cable...I've seen bad cables/drives hang a system, so it's worth trying to power up with it disconnected just to make sure that's not the problem. You can try powering on without the hard drive as well -- basically, it can never hurt to remove all components in order to reduce the number of elements that could possibly be the problem, and that takes you closer to the cause.
Beyond that, I'd question the source of the logic board. Often people sell parts as good when they actually haven't tested them. I'd return it if necessary, and try another.
Anyway, I hope that helps, and let us know how it goes!
John"
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