MacBook Pro won't start up anymore

Dear Community,
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)
I did exactly the same thing I did on my Mac Mini before installing Mavericks (Onyx cache clean up) and restarted.
After restart, the Mac display was black and that white let below the keyboard was glowing. I don't even know what do for this one as it seems like the Mac is "dead" for some reason...

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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