I selected defrost mode to defrost my cheese in my panasonic microwave and after that I do not know how to go back to normal mode.

Hi,

Try to use cotton buds slowly to get rid of melted cheese.

www.panasonic.com

Obtain a service manual

We regret reading about your microwave. At this time we recommend you have the unit evaluated by an authorized service center.

www.panasonic.com/repair

I laughed my socks off. Without the door hook the door opening or closing mechanism is completely broken. If you have the time you could unplug it and dis-assemble the whole thing from the back and re-assemble it with a new hook, perhaps make a new hook from aluminuim sheet. I would throw it away and but a cheaper microwave.

follow this steps and fix it. God bless you

1. Controller is confusedA power surge or random non-reproducible action of the universe may have resulted in the controller's program ending up in an infinite loop. Pull the plug for a minute or two to reset it.
   
2. Defective Interlock switchesThis can result in the controller thinking the door is open and ignoring you.
   
3. CleaningCleaning solutions (spray cleaner) may have gotten inside and shorted out the touchpad or controller. If this happens remove the touchpad, let it air dry for a few days, and then attach it back on the microwave.
   

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#4#ixzz2ZYTO5cC9
http://www.appliancepartspros.com

check this thread ... the answer there worked for me:

http://www.fixya.com/support/t2433472-panasonic_nna554w

Starts and runs for 5 seconds and clicks off and Problem with the Panasonic NN-S963BF / NN-S963WF 1350 Watts Microwave Oven

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

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No owner's manual?

If you're in the US, find it here.

If you're not in the US, see Panasonic.net and look for support / download links.

Otherwise, I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

If that doesn't work, leave it unplugged for about 5 minutes.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

The manual is not available on line so I do not know if this will work but try pressing FUNCTION-0-2.