HELP!! My 15" Macbook Pro Won't Start Up Anymore!!!

Okay, I'm in a horrible situation here.. My dear Macbook Pro suddenly refuses to startup at the time I need it the most; testweek.
I really need it to work as soon as possible, so if anyone could help me I will be grateful forever.. It would really mean a lot to me!
So here's what happened...
Today when I installed my software updates, I noticed the tiger 10.9-update had a red exclamation sign before it. I didn't pay much atention to it, and decided to shut down my macbook pro as usual. When I tried to turn it back on however, it got stuck in the gray screen with the apple logo and the little loading sign. I've shut it down and started it up a few times since, but the same thing kept on happening.
I've already tried holding a few combinations at startup (commandcontrolshutdown-button, optioncommand+PR) but nothing has changed.
Please help me out if you've had the same problem, or if you have any idea on how to solve it... Anything would be great!

The same thing happend to my macbook pro while installing the updates....the continuous gray screen with the spinning gear. I didn't know what to do, but I did take it to a Genious Bar. This whole thing started with a kernal panic then installing several updates at once including itunes, quicktime, airport updater, and a couple others. The last update on the list was OS X 10.4.9, neglegently installing them all at once. Upon installing the OS X 10.4.9 update I too got the error message with the red exclaimation point. Then when I rebooted.....nothing but the gray screen. The genious told me it was because I installed OS X with all the other updates. I needed to update OS X seperate. He suggested doing an archive and install when I got home, because there was nothing he could do for me at the store. So I did an archive and install with the two system disks that came with the computer. It took me an hour and a half to do but this worked saving all of my files and settings. I inserted the disks during the gray screen and when it accepted them I forced the computer to shut down. Upon reboot, I held down "c" for at least 20 seconds and when I released the install disk started working. There is something going on cause I even tried updating OS X 10.4.9 by itself, and again, bootup failure!!! I did the whole install again, and curently sticking with 10.4.8. I'm going back to the Genius Bar tomorrow to find out what the **** is going on here. Good luck.

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Hey there Jesstasmin,
I see that you are getting a gray screen upon startup of your Mac. I have an article that will help you address and troubleshoot this issue effectively:
Mac OS X: Gray screen appears during startup - Apple Support
http://support.apple.com/en-us/ts2570
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http://support.apple.com/kb/HT1379?viewlocale=en_US
http://support.apple.com/kb/HT1455?viewlocale=en_US
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What a day for me, I was about to setup OS Mavericks on two of my Macs, and both are "dead" or in a deep "coma" (Mac mini : https://discussions.apple.com/message/23555153#23555153)
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The same thing happend to my macbook pro while installing the updates....the continuous gray screen with the spinning gear. I didn't know what to do, but I did take it to a Genious Bar. This whole thing started with a kernal panic then installing several updates at once including itunes, quicktime, airport updater, and a couple others. The last update on the list was OS X 10.4.9, neglegently installing them all at once. Upon installing the OS X 10.4.9 update I too got the error message with the red exclaimation point. Then when I rebooted.....nothing but the gray screen. The genious told me it was because I installed OS X with all the other updates. I needed to update OS X seperate. He suggested doing an archive and install when I got home, because there was nothing he could do for me at the store. So I did an archive and install with the two system disks that came with the computer. It took me an hour and a half to do but this worked saving all of my files and settings. I inserted the disks during the gray screen and when it accepted them I forced the computer to shut down. Upon reboot, I held down "c" for at least 20 seconds and when I released the install disk started working. There is something going on cause I even tried updating OS X 10.4.9 by itself, and again, bootup failure!!! I did the whole install again, and curently sticking with 10.4.8. I'm going back to the Genius Bar tomorrow to find out what the **** is going on here. Good luck.

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Hello,
I'm having some problems with starting my Macbook Pro
specs of my macbook pro are here: http://support.apple.com/kb/SP13 (15,4 inch 2,2 ghz)
My macbook pro won't start up anymore, i press the start-up button, it makes the 'krie'-sound then the vans start spinning slowly and then he get's quiet. (screen stays black and the light at the mousepad is on).
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Message was edited by: Klapschaats

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<Edited by Moderator>

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