The fact you haven't done this already make's me wonder if I should reccomend it for fear you lose a finger or aquire a new hairdo. On condition you know what bites and what and what doesn't,just touch the various components while it's buzzing. The culprit is likly vibrating enough to feel. Sound's like the relay located behind the tempature adjustment knob.

Not cooling and very loud, sounds like standard diagnosis for failing compressor. Loud compressor is a sign of nearing end of life. Now that it doesnt cool, you probably reached that point. Get a new one.

Huh? ( >__< )

Klem1, window units are disposable.

It's not likely for this person to be able to fix it... They are really not designed to be taken apart and worked on. The interior of them typically consists of formed styrofoam along with a slew of parts made of plastic.

The cost to fix 'what is likely to be' a crying compressor --- $$$.

What? That's ridiculous. I can buy a new one for cheaper than that.

Congratulations China / Mexico / S Korea / Japan.