I was using my pc with a 500 watt psu and 750 ti. Just switched over to a 1050ti (needs 1 pci e cable) and I'm still running the same i5 6600 cpu. This time I have a 610 watt psu (can max at 675) and it's not turning on. The hdd activity light automatically turns on when i flip the switch. What's the issue. It should be fine.