IMac 27' screen res

Hi there
One of our 27" iMacs (Mac13,2) is stuck at a very low resolution.
System preferences only offers one option - 1280 x 720, not the usual list of resolutions.
Sometimes the relative sizes of the screen elements are correct but "blocky". More often everything appears oversized.
Occasionally you'll get a burst of static while booting.
It's still under warranty (applecare) and has been repaired twice already (Logic board replacement). Both times it was fine for about 30 mins and then reverted back to 1280 x 720.
I contacted Applecare and they recommended I do the following:
- reset the parameter ram
- do a "safe boot"
- try a different user account
- reinstall the OS
I've tried all these thing but no change.
Any other ideas?
Thanks
Phil

Re-contact AppleCare, if the machine was purchased from Apple directly you may want to ask for a replacement machine. If you bought AppleCare then this is not an unreasonable request. If you are still covered by the 90 day AppleCare warranty then it's not really a reasonable request.

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The following general specifications of the devices have experienced periodic shortages is this.
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Serial Number xxxxxxxxxxx
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PROBLEM WAS soln ?
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IN ADDITION
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* I live my productivity as well as routine problems and flat affect my work on the property .
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