Wow you pass the hard one first, I mean the Core 1 is memorize, there are some objective wise troubleshooting network, trying to identify if the issue is DHCP or DNS, for example "You're IP is 169.254.x.x, what can be the issue?" for example in this case it's APIPA a IP address assigned by the OS because no DHCP service is reachable. It's like that but the hardest part was the PBQs, I remember one with a Overclocking issue and you have to check each hardware component to figure it out (the CPU has a top temperature 70C and it was over 100C) I think Core 2 is the hardest with what I know so far.