PC wont boot with new GPU

Adam92Bell

Adam92Bell

Adam92Bell

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18 Nov 2018
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I have just bought a Sapphire Radeon RX Vega 64 Nitro+ as an upgrade and when i have put it in my system it will not boot. however, if i removed the power supplies to the GPU but leave it the PCIe port and turn my PC on, the LED's on the side of the card light up and the system will boot. however, as there is no power to the GPU other than the weak supply from the MOBO it does nothing. Any suggestions on what the issue could be? Many Thanks.
 
Yeah that was one of my first attempts to make it work. I thought maybe the GPU was broken, but it cant really be as it will still draw power from the MOBO to light itself up when not connected to my PSU
 
Damn, was reading about the 2080ti needing both cables and thought this was the same problem.

Have you tried the 2nd PCI-E slot on the motherboard?

Also did you remove the Nvidia drivers first? Although not sure if this would stop it from working.

Have you got access to another PSU to try?
 
What are 4 pin fan plugs from the PSU? Doesn't sound right to me.

Your PSU is likely to have:
6/8-pin PCIe power cables (for graphics cards)
4/8-pin EPS power cables (for CPU power onto motherboard)
SATA (flat) connectors for drives
4-pin Molex connectors (rectangle with two bevelled corners) for older drives, some pumps etc. These shouldn't be connected to your graphics card in any way.

Do you have adapters from 4-pin Molex to your graphics card? Those aren't recommended.

Also DO NOT mix up the PCIe power and EPS power cables. Your PC will likely not boot with these swapped.
 
Am I blind, or there is no PSU model written down here?
Also try second PCI-e slot. Had same issue with some other cards on x79 motherboard.
But I suspect a PSU
 
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