Black screen after getting graphics card upgrade (r9 290)

dude807

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Jun 19, 2013
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Okay so, today my r9 290 finally came in, I ordered it 2 days ago. What I didn't realize before I bought it is that my psu has 2 rails instead of the one that I thought it had, it is a seasonic S12 620w bronze. So my next mission was to try to get the gpu to balance out between each rail. It was kind of a guessing game since the pins aren't labeled at all but I think I came up with a solution. I used the 4 pin adapter that came with it and then used a 6/8 pin with that. I turned it on, and it worked absolutely fine. To test and make sure I was successful I ran Fur mark and prime 95 for 2 hours. It ran perfectly. I stopped the testing and played bf3 with a friend for 30 minutes then stopped and browsed newegg just for fun. As I was browsing my screen suddenly went black. My fans were still running, including my gpu, but there was no display, nor power through the USB. I could tell because I have external hard drive that was plugged in and the light was off. So what happened, did my psu get overloaded? If it did, why? It handled my computer maxed out for 2 hours, why quit 1 hour later while I browse newegg I know I'm cutting it close with the power supply but my system doesn't draw much without the power supply. Here is my build.

I5 4670
12gb's of ram
R9 290 vapor-x
1tb seagate hard drive.
620w seasonic bronze psu

What's happening to my system and how can I fix this. Don't just tell me to buy a new psu, because I would like to avoid doing that.

Thanks for the help.
 

bluejayek

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As a first trouble shooting step, can you try putting your old graphics card back in and booting the computer? Barring this, can you just remove the gpu entirely and boot off of the CPU's inbuilt graphics (Motherboard VGA slot for monitor). This would at least rule out whether you burned out the PSU/motherboard/cpu.
 

bluejayek

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So the computer boots again? It just did a single black screen then came back up?

I'm not really an expert in this, just trying to help out as best I can. Overclocking can cause system instability that might not be apart even two hours in, did you overclock anything?

As per the 'two-rail' power supply, this review says that it really isn't a two rail supply, its just a single rail masquerading as two (assuming this is the model you have). Probably you would be ok just hooking the GPU up to a single rail (again, not an expert. Have never used a two rail PSU.) http://hardocp.com/article/2010/05/18/seasonic_m12ii620_power_supply_review/6
 

dude807

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I didn't over clock anything, nothing really changed when I was browsing newegg. It was all so sudden, it really surprised me. That's why I'm turning to toms hardware because it was so sudden.
 

bluejayek

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Can you confirm that your computer came back up and is running smoothly (for now) after the shutdown?

What are your temperatures like? (Room temperature and GPU/CPU temps. GPU-Z for GPU and Realtemp for CPU work. A thermometer works for the room temp. Or an iguana. If he's running around a lot, it's probably over 30C. A thermometer is probably better though.)
 

dude807

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Yes it was up and running until I decided to shut it down just in case. During the stress test my gpu temps went up to 79c but stayed stable there. Idle the temp is around 35-40.