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Changed 7970 to 280x > PC wont boot

Joppe
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MoBo: Z87 Mpower
Cpu: i7 4790k
RAM: 8GB DDR3

So i just changed my gpu from 7970 msi reference to MSI 280X Twin Frozr. Now the damn pc wont boot. Screen is absolutely black. I know the pc doesnt go to windows because keyboard has no CAPS lock light when i press capslock and the pc shuts down with simple press of the power button, not like usually when it needs long press to shut down. 280X is not broken since it is working in my other pc just fine, and the pcie slot isnt broken because other gpus work in it. What to do? PS. I still have the 7970.

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280X is dead or the PSU is having issues. 7970 uses 50W less than the 280X (which is a 7970 GHz edition)

Archangel (Desktop) CPU: i5 4590 GPU:Asus R9 280  3GB RAM:HyperX Beast 2x4GBPSU:SeaSonic S12G 750W Mobo:GA-H97m-HD3 Case:CM Silencio 650 Storage:1 TB WD Red
Celestial (Laptop 1) CPU:i7 4720HQ GPU:GTX 860M 4GB RAM:2x4GB SK Hynix DDR3Storage: 250GB 850 EVO Model:Lenovo Y50-70
Seraph (Laptop 2) CPU:i7 6700HQ GPU:GTX 970M 3GB RAM:2x8GB DDR4Storage: 256GB Samsung 951 + 1TB Toshiba HDD Model:Asus GL502VT
Windows 10 is now MSX! - http://linustechtips.com/main/topic/440190-can-we-start-calling-windows-10/page-6

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What PSU you got, it seems to be a power delivery issue

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What power supply do you have? Are you sure you connected it porperly?

Don't ask to ask, just ask... please 🤨

sudo chmod -R 000 /*

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280X is dead or the PSU is having issues. 7970 uses 50W less than the 280X (which is a 7970 GHz edition)

The 280X is working in the other pc i have, so it is not broken. i have an 700W CoolerMaster psu and GPU is connected properly to PSU connectors as well as to the pcie slot.

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The 280X is working in the other pc i have, so it is not broken. i have an 700W CoolerMaster psu and GPU is connected properly to PSU connectors as well as to the pcie slot.

Which exact CM PSU?

Archangel (Desktop) CPU: i5 4590 GPU:Asus R9 280  3GB RAM:HyperX Beast 2x4GBPSU:SeaSonic S12G 750W Mobo:GA-H97m-HD3 Case:CM Silencio 650 Storage:1 TB WD Red
Celestial (Laptop 1) CPU:i7 4720HQ GPU:GTX 860M 4GB RAM:2x4GB SK Hynix DDR3Storage: 250GB 850 EVO Model:Lenovo Y50-70
Seraph (Laptop 2) CPU:i7 6700HQ GPU:GTX 970M 3GB RAM:2x8GB DDR4Storage: 256GB Samsung 951 + 1TB Toshiba HDD Model:Asus GL502VT
Windows 10 is now MSX! - http://linustechtips.com/main/topic/440190-can-we-start-calling-windows-10/page-6

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Which exact CM PSU?

It is i think an psu that came with a CM STORM Trooper case, so not the best, it is actually only temporarily in this pc anyways, but i cant really check any specifications of the psu because i have 480mm rad and watercooling stuff on the way so i cant see there really.

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It is i think an psu that came with a CM STORM Trooper case, so not the best, it is actually only temporarily in this pc anyways, but i cant really check any specifications of the psu because i have 480mm rad and watercooling stuff on the way so i cant see there really.

It's the PSU

Archangel (Desktop) CPU: i5 4590 GPU:Asus R9 280  3GB RAM:HyperX Beast 2x4GBPSU:SeaSonic S12G 750W Mobo:GA-H97m-HD3 Case:CM Silencio 650 Storage:1 TB WD Red
Celestial (Laptop 1) CPU:i7 4720HQ GPU:GTX 860M 4GB RAM:2x4GB SK Hynix DDR3Storage: 250GB 850 EVO Model:Lenovo Y50-70
Seraph (Laptop 2) CPU:i7 6700HQ GPU:GTX 970M 3GB RAM:2x8GB DDR4Storage: 256GB Samsung 951 + 1TB Toshiba HDD Model:Asus GL502VT
Windows 10 is now MSX! - http://linustechtips.com/main/topic/440190-can-we-start-calling-windows-10/page-6

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Im just curious why even change? the power difference between 7970 and 280x is negligible 

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Im just curious why even change? the power difference between 7970 and 280x is negligible 

I got the 280x with another pc i just bought and it runs cooler and quieter than the 7970, that is why i would like to have it in my personal rig.

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It's the PSU

yeah i believe the psu is poor and that one is only temorarily, but good news, after installing the gpu over and over again into the mobo, now it actually booted into windows :)
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I got the 280x with another pc i just bought and it runs cooler and quieter than the 7970, that is why i would like to have it in my personal rig.

okay i suppose that makes sense, but can't you crossfire them? i would probably just crossfire them

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