Imac shut off and the fan is really loud...

I have an iMac 27" i7, 16 gb ram. The screen randomly shut off and the fan became really loud. Tried turning it off and back on, but still did the same thing. Tried resetting the PRAM, heard the chimes, but then did the same thing. Is it overheated?

Welcome to the Apple Support Communities
cheddamagee wrote:
Is it overheated?
Check it. Install an app like iStat Pro to check the temperature, and post it here. There are different temperatures (CPU, hard drive, graphic...). If you want, just take a screenshot of the widget (holding Command, Shift and 4 keys, and selecting the widget) and upload it here, pressing the photo icon at the top of the reply box.
Apart, you should run an Apple Hardware Test extended test, to check if there's any problem with the iMac > http://support.apple.com/kb/ht1509 If, after running it, it shows an error, copy it here, because the Mac has got a hardware issue

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Try an SMC reset.
http://support.apple.com/kb/HT3964
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Resetting the SMC on portables with a battery you should not remove on your own
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Late Macbook Pro getting hot and the fan is getting louder

My Macbook is getting very hot and the fan gets louder the longer I have my Macbook on.
It happens whenever and wherever I use it, I don't play games often as I use my Macbook for my Uni work.
Does anyone have any advice?

It would help if you indicated the EXACT model MBP that you have.
Perform a SMC reset:
http://support.apple.com/kb/HT3964
If no success, open Activity Monitor to ALL PROCESSES and set %CPU to display values from high to low.
Download from the Internet a temperature monitoring app like Bresink:
http://www.bresink.com/osx/TemperatureMonitor.html
Post images of both for inspection.
Open the MBP and look for dust an debris inside it, especially in the fans. Clean it out if necessary.
Ciao.

My iMac shut off and won't turn back on.

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i would do an SMC reset the following article tells how to do this:
http://support.apple.com/kb/HT3964
if it still won't power up after this reset i would take to apple store or service provider to have it repaired. the following link shows how to find these close to you:
https://locate.apple.com
hopefully you have backup of the data that is on your computer!

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You are going to have to provide more information...
The only time I ever encountered this was when I went to do a service call on someone with a loose connection on the plug right in the back of his iMac. Not every time but often when he wiggled the screen to adjust it he moved the power bar and / or power cable just enough to momentarily break contact.
We plugged everything in securely and the problem never recurred...
If yours is shutting down & restarting because of a power circuit fault there must be a problem with it that should be looked at.
M

Imac shut off and the fan is really loud...

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