New GTX 780 TI artifacts even after RMA

[Infernoblaster]

My old zotac 780 ti oc had artifacts of green lines on screen and blackscreen when installing the gpu driver.so i RMAed the gpu and got a brand new same gtx 780 ti oc and after using it for sometime i launched siege and it got blackscreen after restart again gpu driver not recognized plus blue dots appear on screen and black screen when trying to install nvidia driver.i have doubt on my PSU(WHETHER ITS THE PROBLEM) my PSU is cooler master thunder 600watt. Help me please please.

 

[Infernoblaster]

Also forgot to mention siege crashed right during power cut in my house and it went to battery and came back(just telling this to explain what and all happened during the problem began)iam hopeless help me please anyone.

 

[geofelt]

Display artifacts is one possible symptom of insufficient power.
Possibly, your psu is going bad.
About the only way to test will be to test with a known good psu.

 

[Infernoblaster]

Any other way to test if my psu is good or not?

 

[geofelt]

Any other way to test if my psu is good or not?

Not really.
The so called "paper clip" test is worthless, it can only confirm a totally dead psu.
Cheap $10 testers are not much better.

If you can not borrow a suitable psu , I suggest buying a replacement from a seller with a good return policy and
a modest restocking fee. 15% is common.
You might do it anyway, Coolermaster thunder is not a high quality psu, tier 3 at best, and likely worse:
http://www.tomshardware.com/forum/id-2547993/psu-tier-list.html

This tier 2 Seasonic 620w S12II unit is on sale for $35 after rebate; a roaring bargain.
https://www.newegg.com/Product/Product.aspx?Item=N82E16817151096

 

[Infernoblaster]

Oh no i checked one thing now the gpu has same serial number as my before rma gpu so zotac fooled me by servicing the same thing and told me it is replaced.what should i do now.

 

[WildCard999]

If you have a friend or family member with a gaming system that has a good PSU you could try the card in there system. If it works fine then the issue is more then likely your PSU.