Glitches on our new iMac with lion osx 10.7.2

Our family has been experiencing various glitches with our computer and we have tried everything to fix it with no success. These are some of the glitches/problems we have experienced:
-When desktop picture changes, it flickers to the next one like an old tv rather than fading like it should
-itunes does not work (doesnt play any song no matter how much you press the play button
-If you try to turn the volume up or down it just shows a circle with a cross and doesnt respond
-Takes far longer to shut down and start up than usual
-Unable to open downloaded applications, eg; minecraft (doesnt open until after 20 or more clicks than shows a crash report), logmein hamachi (says it cant connect to the engine
-Flickers in the middle of the screen when switching between fullscreen apps etc.
These glitches usually only happen when you leave it and login the next day for example.
The store has tried everything from testing and changing the ram, replacing the new computer, and reinstalling the software to no success : (
Any suggestions or advice would be great, but we are running out of things to try and I'm getting really sick of it...

Hi...
Well, as Paul says, you could just let it sleep. I do.
When i will be away for a longer time, i shut it down, and also turn keyboard etc. off.
And yes, its a bit anoying, but hopefully it wil get fixed in some update.
To increase the chances of that, please report this issue to Apple as i have:
http://www.apple.com/feedback/
/Dennis

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