Hey guys, back again, and in need of some help please. Finally built my system the other week and all has been running fine, until i started tinkering like an idiot. 
Changed RAM from 2400mhz to 2666mhz, rebooted an now I've got an issue in that the PC Seems to boot fine, fans running, motherboard lit up, AIO pump running etc, but i'm getting no signal whatsoever from the GPU.
Currently running on an old Samsung tv, which when the system isn't turned on will display no signal. As soon as i turn the system on the screen will go blank for a few seconds, before again displaying no signal. No post screen or anything is displayed at all. I'm at a bit of a loss as to what to do next.
I've tried :
Changing over to secondary bios via motherboard swith
Changing gpu slot position
Disconnecting all unnecessary items like HDDs etc.
Removing ram and trying them in different slots
Tried using a different screen
I have no access to any other GPU's or i would've tried that also. The only plan i have so far is go and buy another cheap gpu and hope that is the issue and i haven't killed anything more expensive!
What do you guys reckon i could try, or what do you think is dead?

Changed RAM from 2400mhz to 2666mhz, rebooted an now I've got an issue in that the PC Seems to boot fine, fans running, motherboard lit up, AIO pump running etc, but i'm getting no signal whatsoever from the GPU.
Currently running on an old Samsung tv, which when the system isn't turned on will display no signal. As soon as i turn the system on the screen will go blank for a few seconds, before again displaying no signal. No post screen or anything is displayed at all. I'm at a bit of a loss as to what to do next.
I've tried :
Changing over to secondary bios via motherboard swith
Changing gpu slot position
Disconnecting all unnecessary items like HDDs etc.
Removing ram and trying them in different slots
Tried using a different screen
I have no access to any other GPU's or i would've tried that also. The only plan i have so far is go and buy another cheap gpu and hope that is the issue and i haven't killed anything more expensive!
What do you guys reckon i could try, or what do you think is dead?

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