Answer to "Won't power on even after replacing logic board."Hi Shaolin, The PRAM battery should have 3.0 Volts, that means that its correct. (When these kind of batteries are "dead" they start having less than 3.0, like 2.6....). The bettery is used the "retain" your configuration for (startup sound volume, startup Screen light level, etc...) Without the battery these values would be erased after restarting your MB. Hope it helps you
Answer to "Swapped lower enclosure now mac wont boot, fans twitch, help!"Hi, It seems this same case [URL|Fans bumping not spinning not powering on] Did you find a solutions to your case?
Answer to "Fans bumping not spinning not powering on"Hi, I have a Macbook Pro that experiences exactly the same issue. - MagSafe working (green light) - Fans bumping with stable frecuency - Power button does nothing except make the funs bumping a little bit faster. - MBP Doesn't do anything, no startup, no sound, no hdd start, no Superdrive start, nothing What i did: 1- Before opening the topcase, the MBP was starting up and booting OS correctly (but with a display failure) 2- Removed the Battery and Memory cards 3- removed all the screws to open the Topcase 4- Removed the topcase without issues 5- Try to turn on to see how the Fans run and internal parts run -> NO Startup anymore!!!! What I have tried: - Reset the PRAM - Reset the SMC - Review all the cables on MB Nothing helps. Note: My Battery is completely dead. I don't know if this it's needed to make some of the resets. I can't understand why just with the opening, its not more starting up? Luci, did you find the solution? Zjef