Question Gpu shuts psu when connected 6pin

[fazi_54]

I have a amd power colour r9 290 triple fan..
Yesterday while playing pummel party it shutdown completely and no response whatsoever by power button.. then after further troubleshooting and psu change i came to know that when i unplugged the 6 pin (although it runs on 8pin+6pin) psu turns on and pc runs without display.. but when i plug the 6pin it shuts and needs to be disconnected from Main power for a few seconds and runs without display

 

[PC Tailor]

Please post your entire system spec including your previous and current PSU make and model.