dell inspiron 3670

Hey all I not long got a Inspiron 3670 as a gift. My 10 year old PC was starting to show it's aged and someone got me a new PC for my birthday. Thinking it would work I took my 4 year old EVGA 600w PSU and GTX 970 out of my old PC and put them in the new. I got a 24pin to 8pin cable for the PSU...