Intermittent vertical lines and freezing

My G4 iBook is having some bizarre problems. Every once in a while, the screen goes wonky and gets streaked with pixelated vertical lines . The line effect seems to also translucently overlay the screen's contents a few pixels adjacent to where they belong.
This problem emerged immediately after I had the logic board replaced, and it occurs at random times, about once an hour or so on average. I manged to get this screen capture (Apple-Shift-3) during one of its episodes and have placed the image at: http://www.flickr.com/photos/kneague/223015879/
Any idea what may be the problem or how it can be fixed? I'm in discussion with Applecare, but I thought I'd throw this out to the forum as well.
Ibook 1.33 G4 Mac OS X (10.4.7)
Ibook 1.33 G4 Mac OS X (10.4.7)

Apple's technical support indicated the problem related to something on the logic board. I'll keep the photo posted in case someone else has a similar problem.

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Ever since Christmas 2011 I have had an intermittent crackly line with dropping broadband problem. Since then I have had 4 engineers out - that I can remember, there may be more!
Let me first add, the crackling, when it happens, happens even if I unscrew master socket and plug corded phone into internal master socket.
Here is my roll of honour of Openreach guys:
Graham - found a fault several hundred meters away, did something, line clear for a day or so.
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But I'm not holding my breath, this is the way it has been since Christmas. Today I cried on the phone to BT Faults as I'm so fed up with it.
About same time last year I had exactly the same symptoms, intermittent crackly line and flakey internet. Luckily it was fixed by a fantastic engineer who went and did something, called me to say all fixed, we chatted on the phone for a while and suddenly the crackle was back. He then said it was because it needed a 'lift and shift' which he organised and then line was good thereafter. Don't know if this is a red herring but the symptoms were exactly the same, and this fixed it.
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Thanks for replies. I am now keeping a log of phone/internet behaviour.
To update: after my last call to BT faults 3 days ago to report fault, it obviously hasn't been raised because I've heard nothing since. I know why this is, at the same time I was also in despair that BT have our house name down wrong. To be precise, the billing address is right, but the account address (?) is wrong. Every time BT engineers come out to find me they ring and say 'Can't find your house' and I have to tell them that the address they have is wrong (only the house name). I've tried to get this fixed twice before, and also mentioned it to the faults girl, so she palmed me off to someone else and obviously didn't raise the fault for me.
No matter for now, as the same evening I rang Plusnet my internet provider. They have been FANTASTIC! They can see my connection has been dropping seriously for ages, apparently I've not been continuously connected for more than 4 hours. They are sending me a new router to rule out my old one, they have told me to plug router into internal main socket and they will monitor, if connection keeps dropping they say they can instruct BT on fault which will then be known to be external as router has been in internal main box socket. They were so helpful.
If only BT were as good! I am seriously fed up of the same old lines I keep getting repeated to me when I call the fault line. And the fact that they keep closing the reported fault when I tell them that it's ongoing and intermittent and needs to be kept open until it is sorted.
Anyway, enough rant for now, at least my internet is working at the mo so I can post this! Will probably follow up some of your suggestions re getting to mods - when I have the energy to do it!
REgards
Kate

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enforcer4u,
she said posting here if help was needed was a good idea...
This is Classroom in a forum.
I believe the first line should have read Use 40 black 1 pixel x 400 pixel vertical lines, and create an experimental composition using varying vertical > horizontal spacing.
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Context
Problem is occurring on a PowerMac 2.66 GHz Dual Core Intel Xeon running OS 10.7.2 with 6 GB RAM.
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Hi HayItsRenee & welcome to the forum.
I'm sorry to hear about your troubles
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~Lyssa

Intermittent vertical lines and freezing

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