Screen saver wont start even after resetting PRAM

Hi, after the 10.8.2 update my screen saver has become increasingly erratic in starting. I have reset the PRAM and checked the running processes but cant see anything wrong. the problem will cure its self after I restart the MAC but after a while stops working.
Any one know of any possible solutions ?
Im worried that it will damage the display.
Details
iMAC 27 inch
3.4 i7 processor
8GB ram
Thanks to any one how answers

Hello, Shaiful Affandi.
Thank you for visiting Apple Support Communities.
I understand that your device will not power on and you have some troubleshooting steps with the issue persisting. There are just a couple more steps that I could recommend in the article below.
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on
http://support.apple.com/HT201412
Cheers,
Jason H.

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Hello, Shaiful Affandi.
Thank you for visiting Apple Support Communities.
I understand that your device will not power on and you have some troubleshooting steps with the issue persisting. There are just a couple more steps that I could recommend in the article below.
If your iPhone, iPad, or iPod touch doesn't respond or doesn't turn on
http://support.apple.com/HT201412
Cheers,
Jason H.

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Before attempting to install Leopard, I upgraded my non-leopard compatible 1.2 GHz processor to a 1.8 GHz leopard compatible one. I also doubled my RAM from 512 to 1024 MB. I then installed leopard but upon restart it continually shut down. Holding down the "c" button at startup, I was able to boot from the leopard disc. I could then even start the computer from my old Panther startup volume. I used 'Disk Utility', ran 'disk repair' and reinstalled Leopard. The same problem persisted.
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japjunk wrote:
Before attempting to install Leopard, I upgraded my non-leopard compatible 1.2 GHz processor to a 1.8 GHz leopard compatible one. I also doubled my RAM from 512 to 1024 MB. I then installed leopard but upon restart it continually shut down. Holding down the "c" button at startup, I was able to boot from the leopard disc. I could then even start the computer from my old Panther startup volume. I used 'Disk Utility', ran 'disk repair' and reinstalled Leopard. The same problem persisted.
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If you have a redundant array of independent disks (RAID) scheme set up, your computer may not start up if you reset parameter random-access memory (PRAM) when you restart.
If this happens, hold down the Option key while you restart your computer, and select your startup disk when you see the prompt.
f a message says “type ‘mac-boot’ and press return”
If the message “type ‘mac-boot’ and press return” appears when you try to start up your computer, some of your computer’s internal settings need to be reset.
NOTE: It may be helpful to print these instructions before you begin.
Or, try these suggestions:
■ Shut down your computer. Turn the computer back on and immediately hold down Command-Option-P-R, continuing to press until you hear the startup sound for the second time. This resets the computer’s parameter random-access memory (PRAM).
IMPORTANT: Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.
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Restart with the X key
Hold down the X key and choose Apple menu > Restart. This may force the computer to start up using your Mac OS X system.
If the computer starts up, release the X key. Choose Apple menu> System Preferences, and then click Startup Disk. Make sure that the disk containing Mac OS X is selected.
Restart with the Option key
If you are unable to start up using the X key, choose Apple menu > Restart and immediately hold down the Option key.
When icons start to appear in the center of the screen, release the Option key. Select the disk that contains Mac OS X, and then click the forward arrow to continue starting up.
■ If resetting PRAM doesn’t solve the problem, reset non-volatile random access memory (NVRAM). When the “To continue booting ...” message appears, type “reset-nvram” and press Return. Then type “reset-all” and press Return.

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Screen saver wont start even after resetting PRAM

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