Testing/servicing tools cost around 600-700 euro and you buy them once of course if you care how to use them.
So why somebody who bought that should test something for free?
If you already know what is damaged on laptop/pc you wont send machine in service to test for you,am i right?
So how you can say they robbing you if you don't know what is broken on PC,they doing their job and for sure you should pay them...
I wasn't arguing about paying them for fixing the computer itself, but, just for saying what's wrong...
If you have to pay them just for telling you what's wrong, then the fix itself costs how much? 300 euro? 
Ok let me to explain you why you should pay them just cause they test hardware for you,for example since laptop doesnt boot up or even show any picture on monitor problem is in hardware so that is inside plastic box.
They must 'open' laptop to see closer where is problem - in 80% fault is on motherboard cause everything is small chips.
So without unique tools-instuments you are unable to find where is problem.
Well lets see situation closer guy(servicer) have to open laptop which means 10-40 screws to remove to come close enough to motherboard then he use instument 300-700 euro worth to test your laptop and put himself on risk to burn some more chip just to tell you where is problem....That least 1-3 hours depend how skilled he is.
And you expect he do that for free?
Price of 30 euro is fair enough just to tell where is problem and if is worth repairing laptop,often they are unable to fix since hardware(chipset) change every 2 year so they cant find matching chip by fair price...
Sending laptop in service on test is way better solution than giving somebody without exprience who will try fix for cheap money and probably make more damage ....
300 euro repairing is worth only on busniness class of laptops whose price is around 1000-3000 euro,models who cost 300-500 euro arent worth to repair if motherboard have to change(100+ euro)
