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Gigabyte Radeon 7970 causing computer to become unresponsive (and black screen)


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#1 Satki

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Posted 26 April 2013 - 04:48 AM

Hi, I just put together a new pc last night with a gigabyte z77-hd3 motherboard and a gigabyte 7970 graphics card, so you'd expect it to work out the box right? Apparently wrong...

On start up with the Gigabyte 7970 installed, the screen will load the mobo start screen (as usual - I can also get access to the system BIOS at this stage), but as soon as it tries to load windows 8, the screen goes black and the computer becomes unresponsive (have to hold the power button down to restart).

The mobo has an integrated graphics card which loads windows fine (I've downloaded and installed all drivers and updates), so it would appear that it is either windows or the graphics card that is the problem.

I've messaged Gigabyte tech support, but am trying here too.

Seems to be more or less the same problem this guy has (http://forum.giga-byte.co.uk/index.php/topic,12192.0.html), except I have access to an onboard graphics card. Is it possible to change the GPU BIOS when running the display from the internal graphics card (with the 7970 plugged in, but not being used as an output) 

Any help?

System specs:

i7 3770k
8gb RAM
Gigabyte z77-hd3 motherboard
http://www.dabs.com/products/gigabyte-pre-assembled-ultimate-bundle--inc-z77-hd3--intel-core-i7-3770k---8gb-vengeance-lp-black--8HJG.html?src=3

Gigabyte Radeon 7970 3gb
http://www.amazon.co.uk/gp/aw/d/B0074VVTPI

Corsair 750W PSU
http://www.amazon.co.uk/gp/aw/d/B004O0P9VC/ref=mp_s_a_1?qid=1366964029&sr=8-2&pi=SL75

 



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#2 anyrepli

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Posted 26 April 2013 - 06:54 AM

So how did you get Windows 8 installed on your new build if the graphics' card never worked. Did you use the integrated VGA and then try to switch to the 7970?

#3 Satki

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Posted 26 April 2013 - 07:06 AM

Basically.

 

I tried to install windows 8 using the output from the 7970 first, and the setup started fine (all dialogue came up - partition setup, copying files etc), but when the computer restarted as part of the install process, (the final stage before the OS loads up), the above blank screen started appearing, preventing a full install - (An error message came up with a message stating that windows did not install correctly). 

 

So I ended up installing windows using the integrated graphics card, which worked perfectly.



#4 anyrepli

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Posted 26 April 2013 - 07:12 AM

OK gotcha! Just an installation check now. Did you install the graphics card using two power feeds as described here:
500W (or greater) power supply with one 150W 8-pin PCI Express power connector and one 75W 6-pin PCI Express power connector recommended.

Note: I extracted that info from here: http://www.amd.com/us/products/desktop/graphics/7000/7970/Pages/radeon-7970.aspx#2

I know you have a Gigabyte but the hardware should be the same (I hope).

Edited by anyrepli, 26 April 2013 - 07:14 AM.


#5 Satki

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Posted 26 April 2013 - 07:38 AM

My PSU doesn't have an 8 pin output, only a 6 pin (which I've connected to the card). However the graphics card did come with a MOLEX to 8 pin adapter which I have connected to the card. ie:

 

http://www.crazypc.com/images/cables/8pin/ad202big.jpg

 

 

As the card is able to display the BIOS (just not anything that loads after), surely the power is set up correctly. I wouldn't expect the manufacturers to allow the card to start without being correctly powered.



#6 anyrepli

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Posted 26 April 2013 - 08:15 AM

My PSU doesn't have an 8 pin output, only a 6 pin (which I've connected to the card). However the graphics card did come with a MOLEX to 8 pin adapter which I have connected to the card. ie:

 

http://www.crazypc.com/images/cables/8pin/ad202big.jpg

 

 

As the card is able to display the BIOS (just not anything that loads after), surely the power is set up correctly. I wouldn't expect the manufacturers to allow the card to start without being correctly powered.

Sorry I asked you to make that check. "Yes, the power is connected correctly would have sufficed." Good luck.



#7 GreenGiant117

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Posted 26 April 2013 - 12:05 PM

Just because the card works partially does not mean the power is correct, a friend ran a GTX460 with only 1 of the 2 power connections plugged in for about a year before issues started showing themselves. Just letting you know.

 

Due to the new card being an AMD and the integrated being Intel you may need to completely disable the Intel display adapter, what the computer is probably doing is showing the BIOS on both cards (not uncommon) then tries to boot (or does boot) on the Intel card. You would encounter the same issue if you had an Nvidia card then moved it down a slot and put in an AMD, the computer would try to boot off the old one but would fail almost every time.



#8 Satki

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Posted 26 April 2013 - 12:33 PM

UPDATE: The card will allow windows to boot in safe mode and is visible as 'radeon 7000 series' in device manager.

 

When I try to start the computer normally (not in safe mode), the computer will now load to the 'welcome' screen (with the user name, picture and the little spinning circle). However, after that the display goes black and unresponsive. A signal is still getting through to the monitor however (the LED on the front of the monitor is lit solidly), if no signal was present, the light would start flashing and the monitor would go into standby.






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