I turn my iMac on and it starts ok but after a minute the monitor goes black

I turn my iMac on and it starts ok but after a minute the monitor goes black, sometimes it comes back on sometimes it stays off, this has only happened since Apple replaced the hard drive.

Then, contact the Apple repair station that did the work.

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    my airport is turned itself off and lose contact with my wifi router, trying to turn it on again will not work, I have to restart my Mac for it to work again, but after 5 minutes, the problem is to go back again.

    Hi ..
    Follow the instructions for resetting the SMC >  Intel-based Macs: Resetting the System Management Controller (SMC) - Apple Support

  • HT201269 When I try to setup my new iPad air, I go through all the steps for the iCloud sign-in and choosing security questions and what not. But after I hit the agree to the terms and conditions... It says Apple ID could not be created because of a serve

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    Please don't indiscriminately dump thousands of lines from the log into this discussion.
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    I turned my iMac on and the fan is so loud...never heard this before. any ideas?

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    While browsing the internet with my iPhone 4S the screen goes black and it looks like it's turning off, but it pops up to the unlock keypad screen. It has plenty battery and I was wondering if it is an issue of using too much of the iPhones RAM or not. I have no other apps open besides Messages. I am getting kind of worried as it started around two weeks ago and it has gotten increasingly frequent.

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  • Can't update iOS 8 on my iPhone5 through iTunes on Windows 8 (error 3004, 3194). Updated host file, opened port 80, 443; turned off security system and firewall, etc. But nothing works. How to solve this problem?

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    http://support.apple.com/kb/ts4451
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    Cheers,
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