Microwave issues

Hello,
I have a GE Profile Spacemaker XL1800. Recently, unit began making unusual noise, beside the normal sound it makes while being used. Also, does not heat and creates a chemical like smell. Any suggestions on the cause of the issues? Any way to test, if appliciable? Could you provide model number of part that might be needed. Thanks Andy

Answered here: http://forum.appliancepartspros.com/microwave-repair/109619-non-functioning-microwave-oven.html#post246786

Gene.