No display or power output from Motherboard

Mar 15, 2018
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Hey all,
I just upgraded my PSU from a 520W to a 620W, having shut down the PC, I removed all cables and replaced the PSU. When I pressed the power button, all fans and lights within the case and on the motherboard turned on.

There was no display from either my GPU or the Motherboard IO as well as no power coming from any USB port on the rear or front IO panels.

Any ideas what could be causing this or potential solutions?

Thanks in advance.
 
Solution
How about try the 520W PSU to see what happens. Maybe the new 620W PSU has problem, or maybe something wrong during you installation. maybe something else.