Can RAM lock on a new iMac?

Hi all
Just a quickie. My mum has recently purchased a brand new iMac. Specs below:
21.5-inch: 2.7GHz
2.7GHz Quad-Core Intel Core i5
1920 x 1080 resolution
4GB (two 2GB) memory
1TB hard drive
AMD Radeon HD 6770M with 512MB
OS 10.7.3
My question is this:
My mum's not into downloading applications and such, so I have to step in and help out. The following might be a little vague but I'll try and be as clear as possible. I downloaded Google Notifier and World of Warcraft These programs were safely in the applications folder, but there appeared to be some files left on the desktop - files that I'd assumed could be trashed. I filed them in an empty file on the desktop until I could determine whether they were of any use. To cut a long story stort, at certian points a file/files were taken from applications or empty folder and dropped onto the desktop. Although my mum didn't seem to notice, I saw something I didn't like. It happened 2 or 3 times when files were taken from folders and dropped onto the desktop. As they dropped there seemed to be some distortion on the screen as a whole. If I had to describe the distortion I would say it was similar to the distortion you might get on a digital tv when the signal drops temporarily. The times that it did happen, it only flickered for a split second in part of the screen, and only when files were dropped. Maybe the system was being overworked? Maybe it was just a glitch? Maybe applications were still running and files were connected a system that was still running? At one point I bordered on taking the machine back for a replacement as if you're paying over a grand for a new computer I would have expected what I saw not to happen. But might be being over cautious as was simply concerned as my mum had paid a lot of money out.
I'm just wondering whether this seems strange? Whether anyone's experienced anything similar?
I've spoken to Applecare. They advised it 'may' be a hardware fault. Or that the RAM may have 'lcoked' when working or large files were taken from a folder and dropped onto the desktop. Can RAM lock? I've never heard of this before?
All now seems to be working fine. Sorry if I haven't been clear.
Many thanks to all who take the time to read through my post.
Kind regards -
Blubber Bear

I don't know about locking RAM, but strongly suggest that you contact Apple Service, iMac Service or Apple's Express Lane. Do note that if you have AppleCare's protection plan and you're within 50 miles (80 KM) of an Apple repair station, you're eligible for onsite repair since yours is a desktop machine. That might also apply to a new machine within it's first 90 days of use.

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