I am experiencing some major problems with my MacBook Pro. I have had some issues with it turning on/off at random times, but today, when starting, I get the grey start-up screen and a recovery bar. After filling in approx 1/4 of the way, the machine dies

I am experiencing some major problems with my MacBook Pro. I have had some issues with it turning on/off at random times, but today, when starting, I get the grey start-up screen and a recovery bar. After filling in approx 1/4 of the way, the machine dies. After starting it in recovery mode, it will not allow me to download OS X Mavericks- it says the disk is locked. Any ideas? I do not have a back-up and do not want to erase everything before I have explored my options. Help?

try forcing internet recover, hold 3 keys - command, option, r - you should see a spinning globe
most people will tell you to do both pram and smc resets (google) and if you still have issues, either clean install (easy) or troubleshoot (hard)

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    Shootist007 wrote:
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    HI, have you blown the dust out lately?
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    If you're sure the RAM is good, try the Hair Dryer trick...
    http://discussions.apple.com/message.jspa?messageID=13240047#13240047
    https://discussions.apple.com/message/15223603#15223603
    https://discussions.apple.com/message/15499912#15499912
    https://discussions.apple.com/message/15613068#15613068
    https://discussions.apple.com/thread/3270112
    https://discussions.apple.com/message/16053892#16053892
    No power light at all...
    https://discussions.apple.com/thread/3692775?tstart=0
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    http://lowendmac.com/ppc/power-macintosh-g5.html
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    Heat gun better...
    https://discussions.apple.com/thread/3916312?tstart=0
    If we don't get more help or answers here, feel free to join my site & ask...
    http://x704.net/bbs

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  • G5 dual 2.7GHz refuses to get past the grey apple logo screen no matter what I do!

    Hoping that someone might be able to help, as I think I have tried pretty much everything and I’m running out of ideas now!
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    BDAqua wrote:
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  • I'm having frequent RSDs with my MacBook Pro 15" Core Duo Model A1150.

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