Okay, so after watching quite a lot of Linus' videos I decided to come over to his site and get some answers, forgive my lack of knowledge.
In some of his recent videos when he's building a 4 machine work station and some cooling system I noticed that when he's building a rig with a Xeon processor and 16 GB RAM, that not being the point, he starts up the system after a video cut and appears to be in an already existing OS!!? I tried building a machine with an existing hard drive and it didn't boot and after investigating a little, apparently you cannot achieve this without formatting the drive (unless cloning the system onto an external drive and then later copying it on after installing the OS for the first time); the reason being that the motherboard is somehow tied down to the hard drive. If anyone knows a way of getting and already OS installed hard drive onto another (not necessarily new) motherboard without formatting or cloning it, please tell me. Thanks
If anyone cares, the components I used were:
ASUS M4A89GTD PRO/USB3 Mother Board
8 GB of DDR3 RIP JAWS RAM
Some AMD Processor I think 3.10 GHz
some GPU I don't care to mention
1 TB SATA 3 Seagate Hard Drive