The smps is like a 250 watt smps.My CPU temperature remains in 40-50 so that mustnt be a problem and when i start gaming GPU temp is around 50 C.One more thing to note is if my CPU powers off then it doesnt start ,I have to switch off the UPS and power on again only then the cpu starts.
Now I have removed my GPU and the system is working fine.What must be the problem is it the SMPS or the GPU.Help me guys.
From the information you provided, I'd say the PSU is too weak. Even though it is rated at 400W, I believe it only has a 17A +12V rail. That is way too small for the graphic card plus other +12V devices. You need to upgrade the PSU.