My computer is blinking ?

Hello,
My computer is blinking ? It does works properly but its blinking once a while as 1/4 sec. at approx. every minute, not regularly.
Any idea ?
Thanks
Louis

Hello CanardxPan,
Thank you for asking your question. It sounds like your computer monitor is flickering occasionally. I would recommend resetting your PRAM with this article:
About NVRAM and PRAM
http://support.apple.com/kb/ht1379
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information.
From: About NVRAM and PRAM
          http://support.apple.com/kb/ht1379
Otherwise would you mind ellaborating on what you are seeing?
Thank you for using Apple Support Communities.
Regards,
Sterling

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