IMac 27 "screen out of control, I am experiencing the transition to sleep mode.

The following general specifications of the devices have experienced periodic shortages is this.
27-inch, Late 2009
CPU  2,66 GHz Intel Core i5
RAM  8 GB 1067 MHz DDR3
Graphic Card  ATI Radeon HD 4850 512 MB
Serial Number  xxxxxxxxxxx
OS X 10.8.5 (12F45)
iMac Display:
Screen: LCD
Res.:    2560 x 1440
Pixel: 32 Bit Colurs
Main Screen: Evet
Online: Evet
Inline: Evet
DisplayPort
PROBLEM
* Routine operation of the device , the screen goes into sleep mode at a time .
* Hard Drive is studying .
* But the screen shuts off completely which does not allow for inaction .
* Therefore, computer harddisk along with the device by pressing the release button 'm having to sleep mode .
* I wake again by pressing the release button .
* The screen is now out of control appropriate to the mode you have to repeat this process every time I'm staying.
I do the following
* System Preferences / Energy Saving / screen to sleep (never )
PROBLEM WAS soln ?
* No
IN ADDITION
* I'm dealing with advertising design business .
* Illustrator, Photoshop, I'm working with software such as performance needs .
* I live my productivity as well as routine problems and flat affect my work on the property .
FINALLY
* Approximately 2 months ago the device's graphics card is renewed.
* Was upgraded with a new video card .
* Graphics card has been replaced after 1 month I faced this problem .
Does the problem is hardware or software- m I have no idea about .
Your ideas and comments are important to me .
Thank you.

Using ten foot pole...
Sounds like you need to take it back to whomever serviced it 2 months ago and have them honor the warranty on there repair work.

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              1.67 GB          Inactive RAM
              546 MB          Wired RAM
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              0 B          Page-outs

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