So I have got a returned issue on this PC. Since upgrading all components except PSU, Antec 900 case and 760GTX at Xmas - I have had murders with PC. Sometimes wont find boot media, sometimes no power. sometimes it just works no issues.... Recently returned m/board/chip/RAM/WD Greed m,2 drive for checking - no issues found. Put PC back together - fine for 1 hour. Now wont start at all, but I have seen this issue before and is already a replacement EVGA 600W PSU. However, already on a second boot drive and finding having to throw more money at replacement parts to resolve. Should I buy a new PSU or swap the case out? What does it sound like the problem might be? Have bought a PSU tester and previous issues did not appear to find anything? Have no PSU spares anymore to test as gave to friend as thought issues resolved.