Pc : Immediately turning on then off

Farhan Aslam

Honorable
Aug 20, 2013
9
0
10,510
I bought gigabyte HD 6750 gpu. when i installed it then turned on the power switch then my Pc turned on without any display and immediately turned off after half a second.
My specs are:
4gb ddr2 RAM
HD 6750 gpu
Pentium D 945 3.40 ghz
Power supply dell 275 w
Can u tell what is the problem?
 

Farhan Aslam

Honorable
Aug 20, 2013
9
0
10,510


No there is no 6 pin pci e power connector. so should it be able to run on a 420w thermal master power supply?