PS4 Original - Power Issues

Hi! My original PS4 won’t power on properly. When I unplug the power cable and plug it back in, it boots up fine. If I then power off the PS4 and go to power it back on, it beeps, blue light then dies. I then have to unplug the power and plug it back in for it to work again.

The fact that I can get it working suggests power is going into it?

Should I look at getting a replacement PSU or is there something else I can try? I have already tried swapping power cables with another working PS4.

Update - when put into rest mode and then PS button pressed, PS4 comes on as normal.

that’s usually caused by a PSU IC…