Problem: Help required (tv issue)

This is a problem with my tv - but stops me watching sat properly :(

I have a Goodmans widescreen from Comet - the £199 spesh.

It's just out of warranty and has developed some peculiar problems....

The picture from any source or any aspect has lost the bottom two inches.

Usually not a problem, but you wathc Sky News or the cricket without that strip...

The other problem is that I cannot turn the volume up past blue pip 8 so it mighty quiet....

It's very annoying and I'm hoping there's an tv guru out there.....