EMac display shaking and squeezing in, IVAD cable?

Hi,
I'm trying to determine if my eMac is experiencing an IVAD cable problem. The screen will pinch in on the sides and both the top and bottom disappear. It shakes and pinches in and then will go back to normal and then the squeezing and shaking begin again. This occurs during the first fifteen minutes or so after startup. A gentle rap on the side of the computer sometimes sets things right. Right now, for instance, the screen is fine. But it took some time to get to this stable state.
I thought it was an electrical outlet problem or an RF problem, so I've removed most of the other things on that circuit and changed the arrangement of nearby stuff. The squeezing and shaking still occurs. I began to notice that the eMac would die while sleeping and then after rebooting I saw the shaking and squeezed screen. I've since removed other items from the circuit, so I may have cleared up one problem (an inadequate circuit). The warm-up period, shaky screen problem remains.
I've done the PRAM and battery replacement stuff. I'm also pretty good at taking the eMac apart (I've replaced the optical drive). If need be, I'll replace the cable. But, the description of my screen acting up seems a bit different then the classic IVAD problem.
Any advice would be appreciated. Thanks.

Thanks for your posts. I opened her up before Christmas to check out the IVAD cable and think about whether it was the cause of the problem. There continued to be issues with the screen (same shaking and shrinking in from the sides). Also, sleep mode induced shutdown. My eMac's serial number is out of range as well.
I backed off of dealing with the IVAD cable when it was obvious that I didn't have the tools, patience, or strength of heart to deal with that big a problem (one end of the IVAD cable is almost inaccessible). I did check to see that it was properly installed. I blew out some dust, put it back together, and pressed the PMU reset button just for grins. After a quick test to see if it ran, I shut everything down for several days for a Christmas trip out of town.
Since our return, there hasn't been a problem. The screen is steady as a rock. Weird?
I'll be interested in what you hear from the Apple folks...
Nat

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Please contact HP over the Phone/E-mail/Chat. If you are in the USA/Canada, please contact HP over the Phone at 1800-474-6836.
HP US Support: http://h10025.www1.hp.com/ewfrf/wc/siteHome?cc=uk&lc=en
HP Worldwide Support: http://www8.hp.com/us/en/contact-hp/ww-contact-us.html
Please find more details for contacting HP from the link below:
http://www8.hp.com/us/en/contact-hp/contact.html
!------------------- Please click the KUDOS star on the left to say 'Thanks'. Please mark 'Accept as Solution' if it answers/solves your problem. Thank you-----------------------------------------------------------------!
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Message was edited by: Hawkfalco

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If you live in the Western US, there is a shop in Oregon that does good things for eMacs. The image of the cable I linked is from their web site. However, if you've not close enough to drive the computer, the cost of shipping a 50-pound eMac to them can be more than a used, working eMac costs.

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