IMac display monitor problems, left side darkens and flickers

I have an iMac with 2.7 GHz Intel Core i5, 16 GB 1333 MHz DDR3, AMD Radeon HD 6770M 512 MB running Mac OS X Lion 10.7.5 (11G63). The last year the left side of the monitor was flickering intermittingly. I didnt think much of it. Then in July, one big flicker caused the left side of the screen to darken slightly. Fortunately, my AppleCare was still in effect,. I contacted Apple and they had me zap the PRAM and also reboot into Recovery mode. The darkness was still apparent. So I took it to an authorized dealer and they fixed the display. Now tonight, one big flicker happened and I noticed that the left side had darkened a little again. I zapped the PRAM and it seems to be ok now, but I'm afraid that the same thing will soon happen. And of course the AppleCare has expired finally. Has anyone encountered this? I have four external hard drives on a shelf right next to the display. This sounds silly, but could they be affecting the display in any way? I moved them a few feet below where they were, hoping that they werent the cause of the problem.
Any advice would be most welcome.
Thanks!

had zapped pram not helped then I would had said that the lcd panel itself was close to the end of it's life and replacement would be required but since it did then I have no real cause to believe the issue would come back

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