While upgrading Mavericks computer shut down and now will not reboot after pressing power button or in safe mode

MMacBook pro running mavericks. Updating to latest version of Mavericks computer did not restart. Could not boot into safe mode either. Spinning wheel goes on and on

Try a SMC reset:
http://support.apple.com/en-us/HT3964
Ciao.

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i put that i held down the home button and all that... sorry, should of made my message a little clearer hun.. but i did try that, ive been searching video's on the net trying to figure out how to fix the problem, but nothing seems to be working... ive just tried pluging the usb lead into my phone while holding the home button then connecting it to my computer to see if itunes fires up, but even that didnt work... i dont know what else to try.

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Clay Ross
[email protected]
powerbook G4 Mac OS X (10.4.6)

3 beeps indicates a RAM problem... do a search on "3 beeps" and you should find a bunch of posts on the topic. Generally, the recommendations are:
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Thanks for the info about having wrongly applied the PMU reset to your Intel Mini. That will account for the fan running full blast. Only known (cheap) fix is to apply the correct SMC reset.
http://support.apple.com/kb/HT3964?viewlocale=en_US
(The Mini's reset procedure is at the very end of that link.)
If that fixes the fan, then we have to consider that your original problem had something to do with the hard drive. Either the hard drive was too full, or else it was starting to fail and needed to re-read sectors -- which would account for things getting very slow.
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Thanks for the quick response.
Command-option-r does take me to a screen with a spinning globe. Below the globe is a drop-down menu from which to select a wi-fi network. My network, however, is not listed. (I am now sitting right by the router, and my iPhone is on the wifi without any problem.) I go instead to manually type it in. I have triple checked the network name and password. I have used both the WEP key, which I have always used, and something that the sticker on the router refers to as the Mac ID, which is the WEP but with two zeros before it. Still the screen shakes as if I have entered the wrong password. I'm not sure what's going on now.

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itsKeef,
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This is my first post here so I hope I am in the correct area. I recently purchased a iMac 24" Intel Core 2 Duo Processor, 2.16GHz, 2GB RAM. It ran well at first but now I keep getting errors that say "There has been a problem with your system, you must turn off the computer by pressing and holding the power button on the back of the panel". This has been happening more and more often.
I took it to a local Apple auth repair shop. The guy looked at it for 10 minutes, said everything is fine and sent me home.
Now when I turn the computer on all I get is a blank white screen that never changes.
I just switched from PCs to Macs, I have to say that I am more then a little frustrated with how poor the computer has been. Does anyone have any suggestions on what I should do now. I do have the Applecare for another 26 months. Thank you.

"There has been a problem with your system, you must turn off the computer by pressing and holding the power button on the back of the panel".
This means Mac OS has crashed. Mac OS shouldn't crash too often. You should give applecare a call. They'll probably tell you to re-install the OS.
Robert

While upgrading Mavericks computer shut down and now will not reboot after pressing power button or in safe mode

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