Make sure you have the right power supply. The MacBook Pro uses 85W power adapters. The MacBook and MacBook Air use 60W power adapters. I had a 60W adapter. That's why my MacBook Pro didn't start. You can find the wattage listed on the power adapter. If the wattage marking has worn off, you can figure it out by multiplying the voltage by the amperage, like this: 16.5 x 3.65 = 60.225W So, it 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.

reset the SMC works but you need to follow this and to do all the steps in the way i describe (for macbook pro with removable battery): 1 - Remove the battery with magsafe connected 2 - Remove Magsafe 3 - Hold start button for at least 5 seconds 4 - plugged Magsafe connector 5 - plugged the battery The light change green to red. Wait 10 minutes and the computer start ! 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 MacBook Pro 15" Core 2 Duo Models A1226 and A1260 Upper Case Cable Replacement 30 - 45 分 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. I also have a 2007 A1226 and had the same problem. It turned out to be the logic board. I am a certified technician so was able to diagnose it myself. After trying the hard reset (removing battery and unplugging from power, holding the power button down for 30 seconds, replacing battery into its place and plugging it back into power) and getting nowhere, I ordered a used and guaranteed working board from eBay for about $119.00, my Macbook Pro was back up and running with no more issues. I am still using it. In fact, I just upgraded the RAM to 4GB and it doubled the speed. Chances are, your logic board is bad. even with the 85 watt power supply, I could not start up...

On my own I figured out the same process as @victorclaussen. Unplug from power supply. Push down on power button. None of this has worked for me. When I try the reset with battery and power out of it and then replug power while button is held in, the fans go wild but nothing else. When I try battery and power out of it, hold power down for 10 seconds, replug Magsafe and battery back in,and try to start it, I hear the optical drive spin once but nothing else. home central air conditioner installationThe battery shows fully charged.york ac unit not working I guess my only other option is to disassemble it and see what happened. cost of replacing outside ac unitI think an 85W power supply I had for it that was not from Apple directly, may have done something to it.

It seemed awfully warm during the charge process; however, the battery does show charged. That same power supply sparks when I go to connect the Magsafe to the computer. I just hope I didn't fry the board. The power button turns the computer off, but not back on. Yosemite OS X 10.10 on mid 2010 MacBook Pro 15" Any help would be greatly appreciated. replaced/soldered a new keyboard connector on the logic board as it had a missing pin,replaced the keyboard twice (the second and third keyboards work correctly),tried jump starting the computer on with the jumpers but this did not work,performed many PRAM resets,repaired Disk and Permissions in Disk Utility,ran Apple Hardware Test in short and extended mode without any issues identified,attempted to do an SMC reset (although I don't see any sign of rather it happened or not) Does anyone know why the power button would turn the computer off, but won't turn the computer on? This is even though removing the mag safe, removing the battery, and then reconnecting the mag safe power supply does turn the computer on automatically.

Once on, the computer appears to work absolutely perfect. hi, i found an old macbook pro a1226 and have not been able to start it up...i plug the magsafe green light turns on then hit power , No response on the screen, however the fans start up inside making noise as if it is on...I have tried without the battery as well...still no response...Any way to help me out would be greatly appreciated...if this can't be fixed was hoping to remove the intel core 2 duo processor and replace the core duo from my old iMac and upgrade it...Anyone know if this swap can be done? Thanks i found out that i was using a 60w magsafe instead of 85w probably i got my mothers one instead. :( i coul eventough start it doing the pressing start button and plugin the 60w magsafe but the funtionalitty was erroneous, no wify no bluetooth shutted down suddenly fans full spin.. Finally i plugged my 85w magsafe and started normally. The battery is dead so im waiting for the new one. I hope that the logic board didnt suffer too much when i booted it with the 60w magsafe.

When i booted it normally with the 85w one i noticed that some projects in ableton live werent going as fluid and it seemed like a loose in processor. It also shuted down as if there were cuts in the energy coming from the magsafe. Some kind of weird thing. I hope that everything stabilizes wth the new bat. Thanks for the info in general! Hello, new solution here. My MacBook Pro early 2008 does not start up, i spent two days trying all methods i found online, was saturday and sunday, finally monday i went to my friends' store, they repair computers and videogame box for bar, they found that the two memory cards (2 gb) does not stay properly in their place, he put a little bit of plastic foam (the one for packaging) on both of them as shown in the picture, than the mac starts up perfectly. Also you can check if the contact parts are loosing their golden color, if they are nearly silver in color it means they are consumed and wouldn't make good contact. I hope your computer start :)

I joined iFixit just to be able to do this. My great thanks to Victor Clausson for his help. After many days and hours of grief with my MBP 15 2008, his solution provided results. Before I did his, I tried them all. His 6/13/2011 posting of unplug the battery, unplug the mag..., hold down..., etc. worked. Our MBP 15 2008 is no longer a door stop. power button won't work, so i disconnected the battery and it powered back on, however when i shut off the macbook, i realized i had to do the same thing again, coz the power button not working, so i had to disconnect the battery and it turned on again, i did this about 3x and now my macbook won't start at all, when connecting the power cord i have an orange color showing and after awhile it eventually turned to green, there is a small strip of lights located on the left side of macbook, when i press the little circled button, it lights up green. can someone tell me if they had the same problem, if so, is it my power cord? do i need to change to 85 w, if so please explain, and if not would you happen to know what the problem is?