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your magnetron is failing thats why its not heating correctly, and as far as the screen you would need to replace the
Control (smart) board assembly this alone is $167.00, and the magnetron runs about $130.00, the control may be the only issue but if its not then it will cost you more to repair than replace the microwave, these have come down a lot and you could get a new microwave for $200.00 to $300.00
here are the parts. magnetron.smart board.