i love that price, that's my third favorite price after "Free" and "Cheap"
very good instructions...i had to trial and error my way through that crap the first time i did that.
as far as the monitor goes, the L1906 is a fairly decent monitor, especially for the cost of free...or damn near close to it. if your LED power indicator is working fine but you get no image, i would suspect an issue with the backlighting. i'm not too sure what to make of the noise you hear from it, but be careful with the replacement bulb if that's what you decide to do...those things are damn fragile...i've broken a ton of those...real easy to do.
i would suspect a backlighting issue, as if it weren't the power LED would not go green but stay an amber color to indicate power received but not turning on. those guides are fairly good guides that tell you what to do and everything, i approve of those guides.