I'm getting somewhere...
I took out the GPU and was able to boot into the BIOS, or the UEFI as it's called now (
Bad Video of it) switched to onboard and Windows loaded.
Shut it down and stuck the GPU back in (
reset CMOS, no reason, just did) booted back into the UEFI and set everything back to default, kinda sorry I didn't take a note of what some of the settings were in there before I did as I haven't a clue what they mean (Low MMIO Align? Can be set to 64 or 1024

Google says set it to 1024, If you say so google

)
Switched primary GPU adapter back to the 6770 and shut down again, stuck the Windows Install disk back in for a fresh Install (badly needed), connected Computer up to TV with a HDMI cable connected to GPU HDMI port, updated everything to the most recent updates that I had downloaded earlier (didn't use any of the original driver disks) including the BIOS-->which I'd usually avoid but you just have to put the update on a USB, turned it on anddddddd no warning

, Catalyst Control Centre is running fine, GPU can be overclocked, multiple displays and all that, Virtu seems to be working.
But,
after about 5mins the display keeps going, black screen. I was fit to cry...
On Computer now using a DVI cable (which actually causes the error to pop back up on restarting

, I read that improper resolution can cause it, seemingly so.)
I'm hoping that it's a faulty HDMI Cable, it can't be something set wrong in the UEFI...it's gonna take time to go through all that.
Will update if I get it sorted.
Worst thing about all this is that it's not even my computer, it's for my little bro, the little ****e won't even say thanks when I get it sorted after specing, ordering, building and installing all of it. Git.
Thanks for help guys.