How do I Reinstall Yosemite on MacBook Pro 15 " late 2009

After upgrade ️to Yosemite the AirDrop and iMessage on my MacBook Pro 15" (late 2009) do not work. I've been advised to reinstall to Yosemite may help, but I don't know to do it. Can anyone help please.

You need an internet connection, and the process takes a long time. Directions are here:
OS X: About OS X Recovery - Apple Support

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Turn it off, connect the power supply then hold down shift/control/option while holding down the power button for 5 seconds - the power supply light will go off and on to show it's done.

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Booted up today, no grey start-up screen. No screen at all. Yet I can still log into Snow Leopard, but again no screen. Rebooted into boot camp, heard windows start. Managed to log in again no screen. Volume controls, keyboard illumination work. Just a black screen.
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J

I had the same problem just now. My 15" MBP (6.2). I followed the following steps and it worked for me. I used another Mac in my house to use screen sharing to accomplish these things:
1) access the /private/var/vm/ directory on the nonworking computer from the working computer. This is invisble so you will have to press cmdshiftg in the finder and go to /volumes/YOURHARDDISKNAME/private/var/vm to get there or use an application that lets you view invisble folders like PathFinder.
2) delete the sleepimage file
3) delete the /system/library/extensions.mkext file
4) eject the drive (drag to the trash)
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6) turn the nonworking computer back on normally(cross your fingers) then if it works,
7) open up the the terminal.app in /applications/utilities
8) type sudo pmset -a hibernatemode 0
9) make sure there is no sleepimage file again
That worked for me...hope it helps for you!

How can I reinstall/recovery my MacBook Pro?

Dear
I was use Maverick, at 26/12/2014 i upgrade it to Yosemite 10.10.1. I am facing problem suddenly its restart. I check disk utility then i saw some problem and disk utility suggest me to reinstall and gave me woman Key like (Command + R).
whatever I tried to do but asking password, I am providing my administration password its not working. i had backup of last 23/12/2014. after upgrade to Yosemite i didn't get any backup i am trying but can't. Day long passing but not getting backup . Let me know what can I do.

Dear
Thanks for your advise. I can't do this. I don't see any option like "show all drives at the debug option"
Please read my problem
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I have macbook pro of later 2009 n have snowleapord 10.6.8 so i can upgrade to mavericks but i have doubt tht in upgrading will my data gets corrupt or lost is it reply please ????

in upgrading to mavericks is my data gets lost/corrupt is it reply ?????

You shouldn't lose any data when upgrading, but always play it safe and make a backup first.

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https://support.apple.com/en-us/HT3910
http://www.thesafemac.com/how-to-reinstall-mac-os-x-from-scratch/
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Ciao.

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MacBook Pro Retina Late 2013 UI Lag after installing Yosemite

Hey everyone,
Ok so my Issue here, and I think I'm not the only one but my MacBook pro retina late 2013 (8GB ram, 256gb SSD) has been experiencing numerous issues after installing Yosemite. For example, the UI lag is at times horrible; after opening several apps, and especially after having a pdf or two open in preview everything becomes so sluggish. the animation of switching to mission control is painstakingly slow, and opening new tabs in safari takes 2 or 3 seconds. I've done a clean install of yosemite but nothing seems to help, what should I do; just revert back to mavericks and cross my finger for a future update?
Any help would be much appreciated, thanks so much !

i am in the same situation as you, late 2013 retina MacBook Pro 15 inch upgraded to yosemite and then clean installed yosemite b/c of UI lag after opening several apps at once... I found that yosemite drained my battery life too, on mavericks i was getting 5-8 hrs of battery life, on yosemite i was getting like 2-3 hrs most.
After exhausting every option out there (apple store genius bar help, apple repair, etc), I came to the consensus that my macbook had no hardware problems at all, it's basically a software problem on apple's end. and until they update yosemite with a specific fix for the UI lag and the battery consumption problems, i am not going back to yosmemite.
what i did was clean installed back to mavericks... this solved every one of my problems, NO LAG, NO BATTERY ISSUES, back to buttery smooth performance, of course without the new UI however... but i can live without new design
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How do I Reinstall Yosemite on MacBook Pro 15 " late 2009

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