Thank you silverhead for your quick response , I never thought about the power supply as the rest of the unit works ok , the nearest alternative supply I have tried is a t- rex power brick , but at 1.5 amps the screen only flashes and no switch lights come on, so I'll probably need to take it back to the retailer to confirm it is this with another working power supply, the unit is still under warranty but hope it is the power supply as I wouldn't really want them to send the unit away, as not to cause possible damage to the unit via the shipping. Thanks again for your quick response, and if any one else has had this problem,please post your fault and solution . Thanks to all, ......... I'm now going for a drink.......cheers ,Kevin from the UK.