Define BOOT then. If you unplug the 4/8-pin Intel power lead the system will start and spin all the fans forever, but it's certainly not BOOTing.
Indeed, but as stated already, this board apparently has and LED read out telling you the fault.

A system without a graphics card will still boot up, it will even go into the operating system if you let it, and boot up normally.
I'm sorry, but you're arguing a point that can't be won. He's trying to diagnose a non-booting PC with no graphics card? If you can diagnose that then you'll make a fortune.
Many Gigabyte boards don't spin the fans at boot-up with PWM turned on. It freaks a lot of people out, but if the CPU isn't hot enough to trigger the minimum start voltage on the PWM fan then the fan will just tick away. Given that he has no graphics card, the BOOT process will terminate at that stage and the system will hang. I've just tested it and without a GPU it just twitches the CPU fan header and stops. If he had case fans attached to the other three pin connectors then they will run permanently, but I don't think he does.
I can diagnose a PC with no graphics card, I've had to do it one way or another.
I'm aware of PWM, so I can see why it confuses people, we used to do some systems in BTW cases that wouldn't turn on even when in the operating system

But as I was saying without the RAM, the whole idea of taking the RAM out and trying to turn it on would take out the possibility of the RAM being an issue, or even if the slots where to be at fault.
