Dreaded Black Screen and automatic shut-down. Why does this happen ?

Why do I get a Black Screen and automatic shut-down ? My iMac felt warm...and I never hear a fan go on..could overheating be why it shuts down?

Hi Tish,
A few things.
If you bough this iMac used with no original install/hardware test discs, you can call Apple at 1-800-MYAPPLE ask for software sales and tell them you need a set of iMac replacement install/hardware test discs. You'll need to give the Apple rep your iMac's serial number.to get the appropriate discs. There will be around a $16 or $17 U.S. charge for discs.
Since your iMac is still freezing, I now wonder if it is RAM and/or hard drive related.
Your iMac maybe freezing because of serious lack of RAM.
How full is your Mac's hard drive?
You only have 1 GB of RAM installed.
OS X 10.6 Snow Leopard really needs more RAM than this.
Intel versions of OS X use more CPU, GPU, RAM and hard drive resources.
OS X, running alone (without any other applications running) can use up between 2 and 4 GBs of RAM memory.
Youf iMac model can 4 GBs of RAM, but only about 3.1 to 3.3 GBs of it will be recognized.
Correct and reliable Mac RAM can be purchased from online Mac RAM sources Crucial memory or OWC (macsales.com).
Without being able to run the Apple hardware test we have no way of knowing the condition of your iMac's hard drive.
The freezing could, also, be caused from a failing hard drive.
If you do not have any backup of your data, this is the time to create one.
Backup your important data to either DVD discs, flash drive/s or purchase an external hard drive to backup all,of your data to.
You can make an exact clone of the data, on your internal hard drive, using a data cloning like CarbonCopyCloner or SuperDuper. OR purchase the external drive and use OS X Time Machine to automatically backup your entire internal drive.

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Dreaded Black Screen and automatic shut-down. Why does this happen ?

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