Hi Sam,
Welcome to Beoworld !
You have one of the slightly rarer Beomasters. A nice little receiver with a very pleasant sound (when working of course). If you'd let us know where you are located, we may be able to guide you to a repairer.
There can be many reasons for it not to work. Aging capacitors is causing lots of problems (ready made kits are available) but also the idle current trimmers in the output stages are prone to failure.
Do you have light in any of the lamps on the front ? If you have light, are the speaker switches in ?
Martin