My A-class has done 8000 miles, used everyday no problems. I stopped it last night and this morning it wont start. There is power every where all lights go on everything works. If the key is turned you hear all the things go on, fuel pump and what else. But it wont start, as if the starter does not kick in, does not turn at all, no funny noises though ,just nothing. It happened once before and i left it for about a day and it started first time. I left it for a day now but it still is dead. Can someone tell me where the relays in the engine compartement are situated? 
And what the problem might be please?
And what the problem might be please?