Sounds a bit tired..... The noise is probably coming from the compressor - it should be sitting on four rubber shock mountings. These settle over time and can lead to a variety of interesting noises, most of which, whilst irritating, are harmless.
Hopefully the bulb blowing was just a result of dampness caused by the defrost process.
Seimens/Bosch is generally decent gear - probably worth getting someone in to check it out - have a look in the Directories section for a UKW engineer in your area, or pop your postcode up and someone will pick up on it.
Which bit of "Unplug it" is causing the problem?
Stop eMailing me. This is a perfectly good forum - use it!