I got a Dell Precision T3600 desktop from work and an Nvidia Quatro 4000 videocard as well. Installed the videocard and now the desktop doesn't power on. Thinking its the Dell PSU as the power button is orange. Any ideas?
This can also be a MB issue as well. If you have a spare video card, try that. If that fails try and remove all RAM, CPU and PCIe cards. After reseating your CPU, start with 1 or 2 sticks of ram in the black slots and try booting. If it boots, keep adding tour add-in cards until they're all in.