Low Power?

[PixlRabt]

Greetings all, long time no see. Did an overhaul of my pc yesterday, upgrading to a Strix Z390F with a 9700k and a coolermaster ML240R AIO to match my H500P case. Everything was great until I was leaving for work roughly 6 hours ago and noticed my two 200mm Coolermaster RGB fans in the front weren't spinning. Quickly looked at all the other fans and everything else was fine. These two fans were daisy-chained together to their own chassis fan header. I didn't have time to troubleshoot so I left it. When i got home I tried different headers, no dice. Then in between tests I noticed the system was triggering my monitor to turn on and stay on, but nothing was being displayed. Then looked at the three 120mm Coolermaster RGB fans in the top (whose lighting is powered and controlled through the coolermaster RGB controller box) were very faint, spinning fine but the lights could barely manage to come on. Now the system is running fine, and the lighting on the AIO and MB are fine, but I can't get the two 200mm fans to run off one header daisy-chained together, and the lights of the top three fans are much dimmer than before (about 75 percent of what they were). 

 

Is this a PSU issue? Fair disclosure its a Silverstone 600w 80+ silver from 2014, does it sound like its failing? Up until I left for work all lights and all fans were running at full brightness and speed. 

[PixlRabt]

For anyone experiencing a similar issue, it was just a dead fan. One of the two front mounted 200mm fans is dead, and it seems like it's shorted (?) and caused neither fan to receive power.