Your PSU is ATX format, which is 150mm tall, 86mm wide, and the length will vary. You want a fully modular PSU that is no longer than 150mm, or you will begin trespassing on cable management space. This Seasonic 850 watt PSU is 140mm long. [IMAGE]
I've got an XPS 8930 and the CPU fan was making a loud noise sometimes. So I bought a replacement heatsink and CPU fan. After replacing the heatsink, the PC would no longer startup. By holding in the reset on the power supply I could see that the case and CPU fans were spinning, but the fan inside the power supply was not. I replaced my new heatsink and fan with the originals and to my dismay that fault was still there. I've checked the cables on the motherboard and all seem to be attached and firmly in place. I tried removing the graphics card, but the fault is still there. Anyone got another idea could try? I am prepared to but a new power supply, but I'd rather not if there was a simpler solution.
XPS 8930, not starting after heatsink CPU fan disassembly