voltage shut down

[vanniko63]

once again , my pc shuts down , get voltage error , pc takes me to asus bios , on start up, this happen last year , i did call into corsair, since issue points to power supply, they claimed it was not power supply , i tested outputs on power supply with tool. all good . now about 8 months past , i get shut down after login or 15 min . presently using pc with issue , all is good, my question is what should i be looking for or testing for, i can monitor voltages in bios , i get over under voltage error periodically so what should i be observing
asus max extreme mobo
corsiar AX1200i power supply
2 gpu,s safire

 

[romirez]

Clean contacts in ATX slot (scratch them a bit).

 

[vanniko63]

good idea , in past i would reset connector to mobo , will give it try , thank you