Microwave sparking inside when I try to cook something ! anything ! what should I do ?

The only thing I can think that may cause this is anything metal. the smallest things such as a tiny bit of tinfoil can cause sparks inside the microwave; I would suggest giving it a good clean and attempting to use it again without anything inside to see if its still sparking;
otherwise I would say you should get a new microwave.

Sparking could be caused by something metallic inside the microwave! Check in side for anything metal like foil!

The following works better if done in "low light".

Put a cup of water or small bowl in the unit, close the door and turn the microwave on.

If there is anything that you can see in the cooking area, there should be sparking and it is coming from something metal, even a small piece of aluminum foil that was left behind. The thing causing the sparking needs to be removed.

If you hear the noise and it is coming from inside the area of the microwave that you cannot see then you can:

1 - Take it to a repair shop.
2 - Depending upon the cost for repair, consider buying a replacement.

If the noise is inside the machine DO NOT CONTINUE TO USE IT. Get it FIXED OR REPLACED for your own safety.

Good Luck

That's not good at all....

check to make sure there isn't any food at the top of the microwave, also, if your microwave allows maybe try turning down the wattage when you cook such as cook on medium or Low wattage.

Also, you may need to just get a new microwave.

I will assume that you do not have any metal items or bits of tinfoil lying around inside the oven.

If the sparks are happening on the inside of the microwave's cooking area while you are cooking, then make sure you clean the inner surfaces really well. Be sure to remove any cooked on food particles that may have splashed up during cooking.

Most likely you have some corrosion or dried food debris inside the cooking area, or perhaps even some food particles stuck to your WAVEGUIDE COVER PLATE. A dirty waveguide cover plate can certainly cause the arcing and sparking you describe.

If the thorough cleaning does not work, you may need to replace the waveguide cover. Here is a link to a short video that shows you exactly how to replace the wave guide cover yourself:

http://www.youtube.com/watch?v=M0xsXjhefy4

Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the video at the website indicated.

If the sparks are coming from somewhere other that the cooking area, then your unit may need more significant electrical repairs or service.

Here is a link to another expert's excellent Microwave Troubleshooting Guide:

http://www.fixya.com/support/r5508031-microwave_oven_basic_troubleshooting

If you choose to rate Heatman 101's tip using the Thumbs Up scale provided, I thank you very much for your time and consideration.
I hope that was helpful to you, good luck and take care.

Joe.

could be fine, did any of the food have any tin foil on it? I would try it without anything inside of it, if it sparks, get rid of it, now!

usually sparks come from turning and cooking with nothing inside the microwave..if there is grease or something on the bottom the heat will generate a spark

The cover is probably the magenetron. That is where the microwaves come from. If the bread was moist, it might have left condensate in the unit which is causing the sparking. Unplug the unit, leave the door open over night. If you can remove that cover, do so. Be sure to carefully replace it before using the unit. Never turn on a microwave with nothing in it.

check halogen light holder and connections, and any damage body, check inside body of microwave oven , because of microwaves some sparks comes from damaged body..