MacBookPro does not power up on AC power or battery.
I've noticed a number of "My Macbook Pro won't turn on" posts here, but my symptoms seems to be different (read: worse) than the other posts that I've read, such as this one.
Here's what's going on:
I have an A1226 15" MacBook Pro (mid 2007) with serial number: W872218YX92. I can't get it to turn on; whether it's plugged into the AC adapter or on a battery, I get no visible or audible response from the machine when I push the power button--none of the lights turn on, none of the fans spin, etc.
I've read about the nVIDIA 8600GT issue, but I don't get any response from the machine at all, so I'm not sure if that's what the problem is. The other thing I've read could be at fault is the 'Left I/O' board', but this thing wont turn on when using AC or a battery. One thing I haven't tried yet is to open it up and check the top cover power switch; is the power switch something that frequently breaks?
Lastly, when the MagSafe adapter is plugged into the machine, the LED on it always glows green--whether or not the battery is plugged in. When the battery IS plugged in, the 'charging' LEDs on it do not light up or blink and thus the battery does not charge.
Make sure you have the right power supply. MacBook Pro's uses 85W power adapters.
MacBook and MacBook Air uses 60W power adapters. That's why my MacBook Pro didn't start.
You can find it out by looking at the power adapter.
I figuered it out by multiply the voltage with the current, like this for example:
V = 16,5V
A = 3,65
16,5 x 3,65 = 60,225W so it's was a 60W adapter I was using.
Which was the wrong type of adapter.
I'm having the exact same problem after reflowing my logic board.
But I found a way to always make it boot.
- Unplug the battery.
- Unplug the magsafe power cable.
- Hold down the powerbutton for about 10 sec and continue to do that.
- While still holding the powerbutton down, insert the magsafe power cable and hold it for another 10 sec.
- Release the powerbutton after those 10 sec and make a "normal" press as if you would normally
turn on your computer.
If that doesn't work then try to remove one RAM memory and switch places and do the method that I told you.
The very first thing I would do is to reseat the Uppercase cable to the logic board as your machine does not seem to be getting a start signal. Check your battery for swelling. Do your restarts without the battery in. MacBook Pro 15" Core 2 Duo Models A1226 and A1260 Upper Case Cable Replacement
Remove completely the top case (unplug it) and try to boot the machine directly from the logic board. Search for the power icon (same as the one on your power button) on the logic board, near the icon there should be two small solder pads. Just briefly bridge the two pads with a small jeweler flat screwdriver (ac adapter must be connected). If the machine power on then your top case power button could be faulty, if not then the DC in board (or the logic board) could be the problem.
Here's a pict from a macbook logic board. Search for the same power icon on yours or PWR letters.
vicclausson's power button 10 sec worked for me. After what i thought was a dead mac. However, my 2007 Macbook pro boots but the fan is on constantly and it won't recognise a new 3rd party battery. The magsafe light doesn't come on either. I did some maintenance on the Mac (thermal contact renewal etc). SMC reset did nothing. Any ideas ?