I would suspect a bad magnetron. You should have a 5-year warranty on the magnetron. While GE will cover the magnetron cost, you would have to pay for labor.
It's cheaper by about $75 to remove it from the wall yourself and take it to the GE-authorized servicer.
If you decide to do that, the installation instructions can save you a lot of time. If you don't still have them, you can download them here:
http://www.geappliances.com/service_and_support/literature/If you or someone you know wants to look into this, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa:
http://tinyurl.com/yzjozkYou can usually find helpful exploded view diagrams and order parts by entering your full model number here:
http://tinyurl.com/gv383There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.
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