Mac Pro CPU upgrade issues

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Okay, so the other day I decide to go ahead and finally upgrade my Mac Pro, the CPUs arrived today and I successfully delidded them (by successfully I mean nothing appears broken!)

 

Now, here's the kicker, I install the new CPUs in, and I hear the chime, but nothing comes up on the display. 

I've remounted the CPUs three times, each time it chimes.

 

I go back and reinstall the original CPUs, exactly the same issue.

 

Now, I upgraded my GPU a year or two back and foolishly sold the GT 120 that came with it, so I have no EFI card, and therefore can't see the boot screen.

 

The HD 7850 that I replaced it with has been acting strange for a while, I'm fairly sure the fan is on it's way out as it only comes on at max speed for a few seconds, then cuts out. Recently, I've been having black lines randomly across both monitors so I guess it's dying.

 

 

So, my question are...

Has the GPU finally died at the most inconvenient time?

Would it chime if the CPU didn't survive the delidding

When you change a CPU on a Mac Pro 4,1 (upgraded to 5,1), do you need an EFI card. I have no issue buying another GT 120 if i need, I sold mine for more than they're on ebay for so I'd still be in a profit, just mildly inconvenienced.

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1 minute ago, BlueScope819 said:

GPU has some problems, get it replaced ASAP. As for the CPU if it chimes the board isn't broken, probably an OS problem. Can you boot to a linux USB while holding down the option key to select it?

Issue is I don't have an EFI card so even if it worked, I couldn't select a boot option!

Could certainly be an OS problem, I don't have another Mac so I'm currently setting up a VM on my laptop to check the drive