New PSU will only boot PC for a split second.

[samt2992]

Installed a Powercooler X-Viper 750w 80+ Bronze PSU to find that it will just flicker on (LEDs and fans will boot up for a second) before switching off. Will have to switch the mains switch off and on before trying again.

I re-installed my previous PSU and it boots the same as before tinkering(perfectly fine).

Current Rig:

• 
  CPU: AMD FX-8350
  GPU: AMD Radeon HD 7850 OC
  RAM:2x8gb
  Drives: 1x SDD120gb, 1xHD/SSD 500gb

 

[gcatalin]

Take it to warranty.

 

[ttcboy]

Google "psu paperclip test" and test it out to make sure that ur PSU is not faulty.

If it's working fine then I suspect it's the MOBO problem since 750W PSU should have more then enough juice to run ur system.

Be reminded though that ur PSU seems to have a bad reputation of blowing up http://www.amazon.co.uk/Powercool-X-Viper-Modular-Bronze-Active/dp/B009Q1EALY .

I would recommend reputable brands like corsair, seasonic, etc..