Patience is the key and tackle each problem in isolation. There's nothing I enjoy more than fault finding EMs. Evey problem has a logical conclusion - it is the learning aspect of "gettiing there" that has always kept my interest in EMs. Oh - and of course - I LOVE playing them 

I hear you Nino . I love fault finding them too .. just gotta stop going around in circles like I am at the moment .
I've only been in the hobby for 5 years (or is it 4 ?) but I am still amazed at how anyone could design all the logic that goes into making an EM work