First of all, it Roper may honor the warranty even though you're not the original owner. I'd contact them first:
http://www.roperappliances.com/support/
If they won't cover it, here are some tips:
A microwave can be dead for many reasons.
If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the thermostat to open. When it cools, it closes the circuit and allows power through again.
If it's random, it may be a bad connection, usually on the control board or fuse holder.
If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.
If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.
This last issue is what I suspect in your case.
If you or a friend decide to look into it, we have critical safety information and disassembly information at our site, linked here on Fixya:
http://tinyurl.com/yzjozk
You can usually find helpful exploded view diagrams and order parts by entering your full model number here:
http://tinyurl.com/gv383
We appreciate your thoughtful rating of our answer.
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