no display when GPU is powered but onboard graphics work.

[f1nt1nt1n]

My pc is a year old I built it myself using all brand new components apart from the PSU which is about 2 years old. a few days ago I returned to my desk to find the display black, it would not wake up so I restarted and all seemed fine,until yesterday when the same thing happened but there was no display on resttart either. I tried plugging into the motherboard HDMI port still nothing,then I unplugged the power from the GPU only then did the display return.please can anyone advise me on how to pinpoint the cause . I suspect it is my PSU but not sure how to make certain. Any other info needed please ask.

 

[Tolis_GR]

You are right to suspect your psu because this is probably the culprit. The only way to make it evident is either to try a different psu or plug your gpu to another computer and see if it works.

 

[Reise Martin]

Check all the cables are correct. Seems like low voltage going to the gpu.

 

[f1nt1nt1n]

Check all the cables are correct. Seems like low voltage going to the gpu.

thanks for the suggestion ,what do you mean by correct? it has been working for a year with no problems up till now, surely it would have had problems before if the cables were attached wrong, do you mean the two PCI-E cables?

 

[f1nt1nt1n]

You are right to suspect your psu because this is probably the culprit. The only way to make it evident is either to try a different psu or plug your gpu to another computer and see if it works.

thank you for the reply, I think a new PSU is on the cards too, I dont have another computer to test it on but plenty of components to set up a test bench breadboard setup so will probably try that the only thing is the only other GPU iI have is a few years old and draws a fraction of what the r9380 does, would that make any difference?

 

[Tolis_GR]

You are right to suspect your psu because this is probably the culprit. The only way to make it evident is either to try a different psu or plug your gpu to another computer and see if it works.

thank you for the reply, I think a new PSU is on the cards too, I dont have another computer to test it on but plenty of components to set up a test bench breadboard setup so will probably try that the only thing is the only other GPU iI have is a few years old and draws a fraction of what the r9380 does, would that make any difference?

Yeah it does make a difference. R9 is power hungry. If you test your other gpu and it works then i would suggest that your psu does not deliver enough juice to your radeon R9 card. What is your other gpu btw?

 

[f1nt1nt1n]

You are right to suspect your psu because this is probably the culprit. The only way to make it evident is either to try a different psu or plug your gpu to another computer and see if it works.

thank you for the reply, I think a new PSU is on the cards too, I dont have another computer to test it on but plenty of components to set up a test bench breadboard setup so will probably try that the only thing is the only other GPU iI have is a few years old and draws a fraction of what the r9380 does, would that make any difference?

Yeah it does make a difference. R9 is power hungry. If you test your other gpu and it works then i would suggest that your psu does not deliver enough juice to your radeon R9 card. What is your other gpu btw?

I have a few to choose from a hd 7870, an old gtx 560 TI, and a gtx 680 I think...I havent had the last one out of storage for a while so I may be mistaken. I have been looking at buying a new psu for a spare anyway so now seems to be a good time, any suggestions as to a decent reliable one in the £100 region?