xbox and computer monitor

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Is it possible to play on an xbox with just a computer monitor or does it have to be attached to a tv? Thank you

An original xbox or an xbox 360?

360's are easy, they output in High Def anyway, you can get cables from lots of places such as Amazon:
www.amazon.co.uk/High-Definition-VGA-Cable-Xbox/dp/B003VD56JS

Older xboxs will be trickier...

It is an xbox 360. Thank you for that info BP. I'll have a look at your link.