Re: Macbook Pro win't boot
try taking the ram out. put one stick in and see if it powers up, if it does put the other in and should be fine. if it doesn't boot up, and you hear beeps, like a 3 beep sound.. you may have bad ram, you may need to go spend 20 or 30 bucks on some new ram for it... i mean its hardware, sometimes they give up, it is made by human beings ya know. anywho, try switching the ram around and try powering it up again, if that's a no go, then you may have bad ram. if you think the ram isn't the problem, which there's a possibility it isn't the problem, try reinstalling the os. either by internet recovery mode, holding (command option R) right after powering it up, while connected to the internet, preferably with an ethernet cable plugged in, it can work wirelessly too! if you can't get internet recovery mode to work, which its a 2011 so i dont see why it wouldnt... then try reinstalling the os through either a usb flash drive with mac os on it ready to be installed from, or an external hard drive with mac os, orrr a mac install disc if your disc drive works. power it up and hold option... if you have an install disc in, hold option and you can click on the cd after seeing an option for that in the list it will show you after holding option for a little bit. if your trying to reinstall the os from an external drive or usb flash drive, do the same by holding down option until you see the drive your future os install will come from, and boot from that and go through everything until you've reinstalled mac os.
if none of that works, try the ram again.. move each stick around and try powering it up.
i have a 2011 macbook pro, i did the same with mine too, used internet recovery mode and reinstalled lion.. i was even getting the three chime beep too, but it wasn't the ram at all, just corrupted os. i'm almost certain yours would have internet recovery mode too.
go step by step.